Answer the questions.[Che-1M]

Question 11 Mark

Identify the element with the following property and arrange them in increasing order of their reactivity:

The metal which is an important constituent of limestone.

Answer

Calcium.

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Question 21 Mark

Identify the element with the following property and arrange them in increasing order of their reactivity:

The metal which exists in liquid state at room temperature.

Answer

Mercury.

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Question 31 Mark

Identify the element with the following property and arrange them in increasing order of their reactivity:
An element which is a soft and reactive metal.

Answer

Sodium.

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Question 41 Mark

Identify and name the metals out of the following element whose electronic configurations are given below.
2, 8, 7.

Answer

Non-metal: chlorine.

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Question 51 Mark

Identify and name the metals out of the following element whose electronic configurations are given below.
2, 8, 2.

Answer

Magnesium.

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Question 61 Mark

Identify and name the metals out of the following element whose electronic configurations are given below.
2, 8, 1.

Answer

Sodium.

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Question 71 Mark

Identify and name the metals out of the following element whose electronic configurations are given below.
2, 1.

Answer

Lithium.

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Question 81 Mark

Compare the radii of two species X and Y. Give reasons for your answer.
Y has 12 protons and 10 electrons.

Answer

The available information makes it clear that:
Species Y with two electrons less (10) than the number of protons (12), is a divalent cation y²⁺ of species X.
Therefore, the radius of species X is more as compared to that of y²⁺.
Note: The radius of cation is always less than that of atom while that of anion is more.

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Question 91 Mark

Compare the radii of two species X and Y. Give reasons for your answer.
X has 12 protons and 12 electrons.

Answer

The available information makes it clear that:

Species X with equal number of protons (12) and electrons (12) is an atom.

Therefore, the radius of species X is more as compared to that of y²⁺.

Note: The radius of cation is always less than that of atom while that of anion is more.

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Question 101 Mark

Arrange the following element in increasing order of their atomic radii.
Li, Be, F, N.

Answer

Li, Be, F and N belong to same period of modern periodic table. As we move left to right in the periodic table, the atomic radii of elements decreases due to high atomic charge and same number of shell. Thus the atomic radii of Li, Be, F and N increase in the order: F < N < Be < Li.

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Question 111 Mark

Arrange the following element in increasing order of their atomic radii.
Cl, At, Br, I.

Answer

Cl, At, Br and I belong to same group of periodic table that is group 17. As we move down in a group, the atomic radii of elements increase due to increasing the number of shell. Thus, atomic radii of Cl, At, Br and I increase in the order: Cl < Br < I < At.

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