Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of : (1) Modern periodic table (2) Newland's law of octaves (3) Dobereiner's triads (4) Mendeleev's periodic table

Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of : (1) Modern periodic table (2) Newland's law of octaves (3) Dobereiner's triads (4) Mendeleev's periodic table
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(2) Newland's law of octaves Explanation: Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column.
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In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it the - (1) Law of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above

Description : In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it ... of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above

Last Answer : (3) Law of Octaves Explanation: Newlands compared his discovery to the octaves found in music and thus, he called it the ‘Law of Octaves’. It is also known as ‘Newlands’ Law of Octaves’.

What are the limitations of Dobereiner’s law of triads?

Description : What are the limitations of Dobereiner’s law of triads?

Last Answer : Dobereiner’s classification was not satisfactory, as he failed to arrange all of the then known elements in the form of triads. He could identify only three triads from the elements known at that time

X and Y are the two elements having similar properties which obey Newland’s law of octaves. How many elements are there in-between X and Y?

Description : X and Y are the two elements having similar properties which obey Newland’s law of octaves. How many elements are there in-between X and Y?

Last Answer : There are 6 elements between X and Y

Which of the following is true regarding Newland’s Law of Octaves? (1) It worked well with only lighter elements. (2) It was applicable only up to calcium. (3) Both are correct (4) Both are incorrect. (4)

Description : Which of the following is true regarding Newland’s Law of Octaves? (1) It worked well with only lighter elements. (2) It was applicable only up to calcium. (3) Both are correct (4) Both are incorrect. (4)

Last Answer : (3) Both are correct Explanation: Both the statements are correct. Hence, option C is correct.

This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by- (1) Johann Wolfgang Döbereiner (2) John Newlands (3) Dmitri lvanovich Mendeléev (4) Henry Moseley

Description : This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by- (1) Johann Wolfgang Döbereiner (2) John Newlands (3) Dmitri lvanovich Mendeléev (4) Henry Moseley

Last Answer : (4) Henry Moseley Explanation: In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property than its atomic mass as described below.

Compare the arrangement of elements in Mendeleev’s and Modern periodic table.

Description : Compare the arrangement of elements in Mendeleev’s and Modern periodic table.

Last Answer : Mendeleev’s periodic table Modern periodic table 1. Elements are arranged in the order of increasing atomic masses. 1. Elements are arranged in the order of increasing atomic numbers.

Explain Dobereiner’s law of triads with an example.

Description : Explain Dobereiner’s law of triads with an example.

Last Answer : According to Dobereiner's law of triads: When elements are arranged in the order of increasing atomic masses in groups of three elements, the atomic mass of the middle element of the triad is equal to the ... Average atomic mass = 177 2 88.5 The atomic mass of middle element Strontium = 88

State Dobereiner’s law of triads.

Description : State Dobereiner’s law of triads.

Last Answer : According to Dobereiner’s law of triads: When elements are arranged in the order of increasing atomic masses in groups of three elements, the atomic mass of the middle element of the triad is equal to the average atomic mass of the other two elements.

Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.

Description : Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.

Last Answer : Ans : Mendeleeve's Law of Classification : Mendeleeve in 1869 arrange elements in order of increasing atomic masses. He placed chemically similar elements vertically beneath each other & concluded that : The ... metals. No Idea Of Atomic Structure : It failed to give the idea of atomic structure.

what is Newlands' law of octaves? Explain with example

Description : what is Newlands' law of octaves? Explain with example

Last Answer : what is Newlands' law of octaves? Explain with example

State Newland’s law of Octaves.

Description : State Newland’s law of Octaves.

Last Answer : New land law of octaves states that “When elements are arranged in the order of increasing atomic mass, the properties of the eighth element (starting from any given element) are a repetition of the properties of the first element”

What are Dobereiner’s triads? Give example of 2 triads.

Description : What are Dobereiner’s triads? Give example of 2 triads.

Last Answer : Ans: he arranged the elements in several sets of 3 elements .these sets were called triads which resembled with each other in chemical properties and atomic mass of the middle element was approx the mean of the atomic masses ... 35.5 +127)/2 =81.25 (ii) Calcium (40) ,strontium(88.5) and barium (137)

DRAWBACK OF DOBEREINER’S TRIADS:-

Description : DRAWBACK OF DOBEREINER’S TRIADS:-

Last Answer : Only known some triads elements are identify from Dobereiner’s triads.  Other triads did not obey Dobereiner’s rule.  Hence, it is not useful.

The names of the scientists, Newlands, Mendeleev and Meyer are associated with the development of (a) Atomic structure (b) Metallurgy (c) Periodic table of elements (d) Discovery of elements

Description : The names of the scientists, Newlands, Mendeleev and Meyer are associated with the development of (a) Atomic structure (b) Metallurgy (c) Periodic table of elements (d) Discovery of elements

Last Answer : Ans:(c)

Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic Table? (1) Scandium (2) Gallium (3) Titanium (4) Germanium

Description : Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic Table? (1) Scandium (2) Gallium (3) Titanium (4) Germanium

Last Answer : (2) Gallium

Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum

Description : Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum

Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium

Newlands' table, the elements were placed with the halogens - (1) Mn and As (2) Fe and Se (3) Ce and La (4) Co and Ni

Description : Newlands' table, the elements were placed with the halogens - (1) Mn and As (2) Fe and Se (3) Ce and La (4) Co and Ni

Last Answer : (4) Co and Ni Explanation: Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note.

State Mendeleev’s periodic law. Write two achievements of Mendeleev’s periodic table -Science

Description : State Mendeleev’s periodic law. Write two achievements of Mendeleev’s periodic table -Science

Last Answer : Mendeleevs Periodic Law: Properties of elements are the periodic function of their atomic masses. Achievements:i It could classify all the elements discovered at that time. ii It helped in the discovery of new elements. iii it helped in the correction of the atomic mass of some of the elements.

NEWLAND’S OCTAVES

Description : NEWLAND’S OCTAVES

Last Answer :  After failure of Dobereiner's triads, newland's octaves classification was done.  56 elements were discovered.  Elements are arranged in an increasing order of their atomic masses.  Every ... later several elements were known.  It not includes inert gases because they were not discovered.

In which group of elements of the modern periodic table are halogen placed ?

Description : In which group of elements of the modern periodic table are halogen placed ?

Last Answer : In which group of elements of the modern periodic table are halogen placed? a. 17 b. 6 c. 4 d. 2

Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements

Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements

Last Answer : 7

What are the limitations of Newland law of Octaves?

Description : What are the limitations of Newland law of Octaves?

Last Answer : Newland law of octaves could not be extended after 17 elements.

How many stages are there in Mendeleev's Periodic Table ?

Description : How many stages are there in Mendeleev's Periodic Table ?

Last Answer : There are 7 stages in Mendeleev's Periodic Table .

What are the periods in Mendeleev's periodic table?

Description : What are the periods in Mendeleev's periodic table?

Last Answer : Because some of the elements were not yet discovered so he left them blank for other elements to be discovered. -bobby corner

What are the periods in Mendeleev's periodic table?

Description : What are the periods in Mendeleev's periodic table?

Last Answer : Because some of the elements were not yet discovered so he left them blank for other elements to be discovered. -bobby corner

Mendeleev's periodic table was based on?

Description : Mendeleev's periodic table was based on?

Last Answer : increasing order of atomic mass

State the characteristics of Mendeleev’s periodic table.

Description : State the characteristics of Mendeleev’s periodic table.

Last Answer : 1) Mendeleev’s periodic table consists of 7 periods (horizontal) and 9 groups (vertical). 2) Elements are arranged in the increasing order of their atomic weights. 3) The elements that have similar property were placed in vertical columns.

According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the

Description : According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the

Last Answer : eighth element starting from oxygen

What is Mendeleev’s periodic law?

Description : What is Mendeleev’s periodic law?

Last Answer : What is Mendeleev’s periodic law?

What is Mendeleev's periodic law?

Description : What is Mendeleev's periodic law?

Last Answer : the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.

What is Mendeleev's periodic law?

Description : What is Mendeleev's periodic law?

Last Answer : the principle that chemical properties of the elements are periodic functions of their atomic numbersMendeleev's periodic law states that properties of elements are periodic functions of their atomic masses.

Mention the merits of Mendeleev’s periodic law.

Description : Mention the merits of Mendeleev’s periodic law.

Last Answer : Mendeleev left vacant spaces in the table for the elements that were to be discovered. He was able to predict the atomic mass and properties of elements even before their discovery. His periodic table helped to discover new elements like germanium.

State Mendeleev’s periodic law.

Description : State Mendeleev’s periodic law.

Last Answer : Mendeleev’s periodic law states that “The properties of elements are periodic functions of their atomic mass”.

What similarity was observed by Newland in the properties of elements and octaves of music?

Description : What similarity was observed by Newland in the properties of elements and octaves of music?

Last Answer : When Newland arranged the elements, he found that the properties of eighth element resembled the properties of the first element, This repetition in the properties is just like the repetition of eighth note in an octave of music. (sarega ma pa da nisa)

Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Description : Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer : (4) Soft iron Explanation: Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.

Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Description : Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer :  Soft iron

The periodicity of repetition of properties in Newland’s law was

Description : The periodicity of repetition of properties in Newland’s law was

Last Answer : eight.

Why did some of the elements did not match perfectly on Mendeleev's table?

Description : Why did some of the elements did not match perfectly on Mendeleev's table?

Last Answer : Need answer

How many elements did Mendeleev introduce the modern periodic table ?

Description : How many elements did Mendeleev introduce the modern periodic table ?

Last Answer : Mendeleev introduced the modern periodic table with 67 elements.

In the modern periodic table, the elements are arranged in the ascending order of their

Description : In the modern periodic table, the elements are arranged in the ascending order of their

Last Answer : atomic number.

(a) What are ‘groups’ and ‘periods’ in the ‘periodic table’? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary? Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.

a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.

What two elements in the periodic table have properties in common with Calcium?

Description : What two elements in the periodic table have properties in common with Calcium?

Last Answer : Be, Mg, Ca, Sr, Ba, Ra. All the elements in that column haveproperties similar to each other.

What groups of elements should have very different chemical properties in the periodic table?

Description : What groups of elements should have very different chemical properties in the periodic table?

Last Answer : Feel Free to Answer

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are (A) Cobalt, chromium & tungsten (B) Cobalt, chromium & nickel (C) Molybdenum, tungsten & chromium (D) Cobalt, zirconium & molybdenum

Description : Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are (A) Cobalt, chromium & tungsten (B) Cobalt, chromium & nickel (C) Molybdenum, tungsten & chromium (D) Cobalt, zirconium & molybdenum

Last Answer : : Option A

Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are: (A) Nickel, cobalt & chromium (B) Tungsten, chromium & cobalt (C) Manganese, chromium & cobalt (D) Tungsten, molybdenum & nickel

Description : Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are: (A) Nickel, cobalt & chromium (B) Tungsten, chromium & cobalt (C) Manganese, chromium & cobalt (D) Tungsten, molybdenum & nickel

Last Answer : Option B

The periodic law states that the properties of elements will repeat when the elements are arranged by _______.?

Description : The periodic law states that the properties of elements will repeat when the elements are arranged by _______.?

Last Answer : increasing atomic number

The metal ion present in vitamin B12 is (1) cobalt (2) zinc (3) nickel (4) iron

Description : The metal ion present in vitamin B12 is (1) cobalt (2) zinc (3) nickel (4) iron

Last Answer : (1) cobalt Explanation: The structure of B12 is based on a corrin ring, which is similar to the porphyrin ring found in heme, chlorophyll, and cytochrome. It contains the biochemically rare element cobalt sitting in the center of the ring. Also called cobalamin, it is a water-soluble vitamin.

Which of the following imparts a blue colour to glass? (1) Cobalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Description : Which of the following imparts a blue colour to glass? (1) Cobalt oxide (2) Copper oxide (3) Iron oxide (4) Nickel oxide

Last Answer : (1) Cobalt oxide Explanation: The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of ... colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc.

Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel - (1) paramagnetic substances (2) ferromagnetic substances (3) diamagnetic substances (4) non-magnetic substances

Description : Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel - (1) paramagnetic substances (2) ferromagnetic substances (3) diamagnetic substances (4) non-magnetic substances

Last Answer : (3) diamagnetic substances Explanation: Those materials which when placed in a magnetic field become weakly magnetized in a direction opposite to that of the applied field, are called as diamagnetic materials ... : bismuth, antimony, copper, gold, quartz, mercury, water, alcohol, air, hydrogen etc.