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

Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum
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Ans.Because Mendeleev gave priority to similarities in properties.
Germanium and gallium
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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

Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium

Description : Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium

Last Answer : ANSWER: C -- GALLIUM

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.

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

Description : 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

Last Answer : (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.

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.

(a) Why do we classify elements? (b) What were the two criteria used by Mendeleev in creating his Periodic Table? ... Justify your answer. -Chemistry 9th

Description : (a) Why do we classify elements? (b) What were the two criteria used by Mendeleev in creating his Periodic Table? ... Justify your answer. -Chemistry 9th

Last Answer : (a) It is done so as to study the properties of elements conveniently. (b) Increasing order of atomic mass and similarities in chemical properties (especially nature and formulae of oxide and hydride formed). ... at that time. (e) They will be kept at same slot as they have same chemical properties.

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.

What did Moseley use to reorder the elements of Mendeleev periodic table?

Description : What did Moseley use to reorder the elements of Mendeleev periodic table?

Last Answer : Henry Moseley discovered a relation between X-ray spectra and the atomic number of chemical elements.

How did Mendeleev arrange the known elements in this periodic table?

Description : How did Mendeleev arrange the known elements in this periodic table?

Last Answer : Feel Free to Answer

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)

Mendeleev arranged the elements in his periodic table on the basis of

Description : Mendeleev arranged the elements in his periodic table on the basis of

Last Answer : atomic mass.

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 .

Who invented the modern Periodic table? (1) Faraday (2) Mendeleev (3) Newton (4) Bohr

Description : Who invented the modern Periodic table? (1) Faraday (2) Mendeleev (3) Newton (4) Bohr

Last Answer : (2) Mendeleev Explanation: Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.

What are the important features of Mendeleev periodic table?

Description : What are the important features of Mendeleev periodic table?

Last Answer : Ans: based on(i) increasing atomic mass (ii) similarities in properties of elements.(iii) 63 elements divided in 7 horizontal row called periods and 8 vertical groups

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.

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.

Which is a property that Mendeleev's predicted for gallium?

Description : Which is a property that Mendeleev's predicted for gallium?

Last Answer : Examples: density, melting point, atomic weight, density and formula of oxide.

How Mendeleev organized his periodic table?

Description : How Mendeleev organized his periodic table?

Last Answer : By the increasing Atomic Mass.

How was Mendeleev and periodic table different from those of other chemists of the time?

Description : How was Mendeleev and periodic table different from those of other chemists of the time?

Last Answer : Feel Free to Answer

How did Mendeleev arrange the known element in his periodic table?

Description : How did Mendeleev arrange the known element in his periodic table?

Last Answer : He arranged the elements in the increasing order of their atomicmasses and repeating periodic properties.

How did Mendeleev arrange the known element in his periodic table?

Description : How did Mendeleev arrange the known element in his periodic table?

Last Answer : He arranged the elements in the increasing order of their atomicmasses and repeating periodic properties.

Who created periodic table? A. Faraday B. Lavoisier C. Arrhenius D. Mendeleev (Answer)

Description : Who created periodic table? A. Faraday B. Lavoisier C. Arrhenius D. Mendeleev (Answer)

Last Answer : D. Mendeleev (Answer)

In his periodic table, Mendeleev could not assign a correct position to

Description : In his periodic table, Mendeleev could not assign a correct position to

Last Answer : Hydrogen

Name the person who developed a table of elements which revealed regularities in elemental properties in 1869? w) Theodore Richards x) Antoine Lavoisier y) Dmitri Mendeleev z) Svante Arrhenius

Description : Name the person who developed a table of elements which revealed regularities in elemental properties in 1869? w) Theodore Richards x) Antoine Lavoisier y) Dmitri Mendeleev z) Svante Arrhenius

Last Answer : ANSWER: Y -- DMITRI MENDELEEV

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

Which of the 3rd period elements loses electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Silicon

Description : Which of the 3rd period elements loses electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Silicon

Last Answer : ANSWER: A-SODIUM

Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Description : Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Last Answer : ANSWER: Y -- CARBON-SILICON GROUP

Modern periodic law had been given by (1) Moseley (2) Mendeleev (3) Lother-Mayer (4) Lavoisier

Description : Modern periodic law had been given by (1) Moseley (2) Mendeleev (3) Lother-Mayer (4) Lavoisier

Last Answer : (1) Moseley Explanation: In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.

State Mendeleev Periodic Law.

Description : State Mendeleev Periodic Law.

Last Answer : Ans: The chemical and physical properties of the elements are periodic functions of their atomic masses.

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”.

Where is the position of silicon in the periodic table ?

Description : Where is the position of silicon in the periodic table ?

Last Answer : The position of silicon ( Si) in the periodic table is in phase 3 and group 14.

What Elements in order of increasing size sulfur silicon oxygen aluminum and neon?

Description : What Elements in order of increasing size sulfur silicon oxygen aluminum and neon?

Last Answer : Elements in order of increasing size of the covalent atomicradius: neon, oxygen, sulfur, silicon, aluminum.

Which of the following elements is not present abundantly in earth’s crust ? A. Silicon B. Radium (Answer) C. Aluminum D. Carbon

Description : Which of the following elements is not present abundantly in earth’s crust ? A. Silicon B. Radium (Answer) C. Aluminum D. Carbon

Last Answer : B. Radium (Answer)

Steel is composed of a number of elements. The two essential elements are iron and w) aluminum x) carbon y) nickel z) silicon

Description : Steel is composed of a number of elements. The two essential elements are iron and w) aluminum x) carbon y) nickel z) silicon 

Last Answer : ANSWER: X -- CARBON

Where in the periodic table would we classify silicon?

Description : Where in the periodic table would we classify silicon?

Last Answer : Need answer

Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie

Description : Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie

Last Answer : ANSWER: Z -- MARIE CURIE

What was the Mendeleev’s basis for classification of elements?

Description : What was the Mendeleev’s basis for classification of elements?

Last Answer : Mendeleev’s classification is based on atomic mass.

MENDELEEV’S PERODIC TABLE

Description : MENDELEEV’S PERODIC TABLE

Last Answer :  The physical and chemical properties of element are a periodic function of their atomic masses.  The tabular arrangement of the element based on the periodic law is called Mendeleev's ... different properties. E.g. Manganese is placed with halogens which totally differ in the properties.

In the second and third stages of the periodic table, after how many elements does religion repeat ?

Description : In the second and third stages of the periodic table, after how many elements does religion repeat ?

Last Answer : In the case of the second and third stages of the periodic table, religion repeats itself after the eight elements.

What is a Periodic Table of Elements ?

Description : What is a Periodic Table of Elements ?

Last Answer : By classifying the elements of the same type of religion in the same category , replacing all the discovered elements , the current table of elements is called the periodic table of elements.

In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern

Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).

Elements present in the 2nd Group of the Periodic Table are also called ?

Description : Elements present in the 2nd Group of the Periodic Table are also called ?

Last Answer : Ans alkaline earth metals

Name the elements present in the 2nd Group of the Periodic Table:

Description : Name the elements present in the 2nd Group of the Periodic Table:

Last Answer : Ans beryllium, magnesium, calcium, strontium, barium and radium