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

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

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.

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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

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

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

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

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

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

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What are the periods in Mendeleev's periodic table?

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

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What are the periods in Mendeleev's periodic table?

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

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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.

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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

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”.

The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium

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Last Answer : D) Gallium and caesium

Name two elements that find wide application in transistor industry – (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

Description : Name two elements that find wide application in transistor industry – (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

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Name two elements that find wide application in transistor industry (1) Silicon and Germanium (2) Carbon and Platinum (3) Iridium and Germanium (4) Tungsten and Platinum

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Last Answer : Silicon and Germanium

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 ?

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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

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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 ?

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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:

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Which group elements show very low ionization enthalpy in the periodic table?

Description : Which group elements show very low ionization enthalpy in the periodic table?

Last Answer : First group elements (alkali 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 : beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metals. 

Name the elements present in the 1st Group of the Periodic Table

Description : Name the elements present in the 1st Group of the Periodic Table 

Last Answer :  lithium, sodium, potassium, rubidium, caesium and francium. They are collectively known as the alkali metals. 

Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B Elements of Group 16 occur as cations in ionic compounds. C Oxides of elements in Groups 16 and 17 are basic. D The halogens (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.

Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.

Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Who is given credit for first arranging the elements in the Periodic Table?

Description : Who is given credit for first arranging the elements in the Periodic Table?

Last Answer : ANSWER: MENDELEEV

The block of elements in the periodic table which are filling the 4-f electron shell are known as:

Description : The block of elements in the periodic table which are filling the 4-f electron shell are known as:

Last Answer : ANSWER: LANTHANIDES

Name this chemical element. The principal use of this element has been in solid-state electronic devices, notably transistors. Its position in the periodic table is in group "4A". The element's atomic number is 32 and its chemical symbol is Ge.

Description : Name this chemical element. The principal use of this element has been in solid-state electronic devices, notably transistors. Its position in the periodic table is in group "4A". The element's atomic number is 32 and its chemical symbol is Ge.

Last Answer : ANSWER: GERMANIUM

Four of the lightest ten elements in the periodic table are solids at standard temperature and pressure. Name these four elements.

Description : Four of the lightest ten elements in the periodic table are solids at standard temperature and pressure. Name these four elements. 

Last Answer : ANSWER: LITHIUM, BERYLLIUM, BORON, CARBON

What is the family name given to the elements in group 1A of the periodic table?

Description : What is the family name given to the elements in group 1A of the periodic table?

Last Answer : ANSWER: ALKALI METALS

The elements in group 1A of the periodic table are called: w) halogens x) alkaline earths y) alkali metals z) rare earths

Description : The elements in group 1A of the periodic table are called: w) halogens x) alkaline earths y) alkali metals z) rare earths

Last Answer : ANSWER: Y -- ALKALI METALS

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 : increases

Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is (A) Ni (B) V2O5 (C) Fe (D) Aluminium triethyl combined with titanium tetrachloride

Description : Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is (A) Ni (B) V2O5 (C) Fe (D) Aluminium triethyl combined with titanium tetrachloride

Last Answer : (D) Aluminium triethyl combined with titanium tetrachloride

Which of the following has the highest density and the lowest melting point? (A) Stainless steel (B) Titanium (C) Lead (D) Aluminium

Description : Which of the following has the highest density and the lowest melting point? (A) Stainless steel (B) Titanium (C) Lead (D) Aluminium

Last Answer : (C) Lead

Which of the following is the lightest of engineering metals? (A) Magnesium (B) Aluminium (C) Titanium (D) Tin

Description : Which of the following is the lightest of engineering metals? (A) Magnesium (B) Aluminium (C) Titanium (D) Tin

Last Answer : (A) Magnesium

The most abundant metal present in the earth's crust is; (A) Iron (B) Copper (C) Titanium (D) Aluminium

Description : The most abundant metal present in the earth's crust is; (A) Iron (B) Copper (C) Titanium (D) Aluminium

Last Answer : (D) Aluminium

Which of the following commonly used condenser tube materials has the lowest thermal conductivity? (A) Admiralty brass (B) Stainless steel (C) Aluminium brass (D) Titanium

Description : Which of the following commonly used condenser tube materials has the lowest thermal conductivity? (A) Admiralty brass (B) Stainless steel (C) Aluminium brass (D) Titanium

Last Answer : (B) Stainless steel

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)? (A) Aluminium (B) Copper (C) Titanium (D) Stainless steel

Description : Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)? (A) Aluminium (B) Copper (C) Titanium (D) Stainless steel

Last Answer : Option C

Titanium is used in dentistry A. In a very pure form in implants B. In an alloy with aluminium in casting for crowns and bridges C. In an alloy with nickel in orthodontic wires D. A and B E. A, B and C

Description : Titanium is used in dentistry A. In a very pure form in implants B. In an alloy with aluminium in casting for crowns and bridges C. In an alloy with nickel in orthodontic wires D. A and B E. A, B and C

Last Answer : E. A, B and C

How many elements does gallium have?

Description : How many elements does gallium have?

Last Answer : Gallium is a chemical element. One might say it has one element.

What is the year of discovery of scandium ?

Description : What is the year of discovery of scandium ?

Last Answer : The year of the discovery of Scandium is 1879 .