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Introduction

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Question

Choose from the following:
$_{6} C,_{8} O,_{10} N e,_{11} N a,_{14} S i$
(i) Elements that should be in the same period
(ii) Elements that should be in the same group
State reason for your selection in each case:

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Solution

1. $_{6} C,_{8} O$ and $_{10} N e$ all belong to period 2 as they have two shells whereas $_{11} N a$ and $_{14} S i$ belong to period 3 as they have 3 shells.

2. $_{6} C$ and $_{14} S i$ belong to the same group 14 since they have same number of valence electrons.

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Q. Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
a. ₃Li, ₁₄He, ₁₁Na, ₁₅P Which of these elements belong to be period 3?
b. ₁H, ₇N,₂₀Ca, ₁₆S, ₄Be, ₁₈Ar Which of these elements belong tot he second group?
c. ₇N, ₆C, ₈O, ₅B, ₁₃Al Which is the most electronegative element among these?
d. ₄Be, ₆C, ₈O, ₅B, ₁₃Al Which is the most electropositive element among these?
e. ₁₁Na, ₁₅P, ₁₇Cl, ₁₄Si, ₁₂Mg Which of these has largest atoms?
f. ₁₉K,₃Li, ₁₁Na, ₄Be Which of these atoms has smallest atomic radius?
g. ₁₃Al, ₁₄Si,₁₁Na, ₁₂Mg, ₁₆S Which of the above elements has the highest metallic character?
h. ₆C, ₃Li, ₉F,₇N, ₈O Which of the above elements has the highest nonmetallic character?

Q. Given below are some elements of the modern periodic table:

_{4} B e,_{26} F e,_{14} S i,_{19} K,_{20} C a

(i) Select the element that has one electron in the outermost shell and write its electronic configuration.
(ii) Select two elements that belong to the same group. Give reason for your answer.
(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?

Consider the following elements :

$_{20} C a,_{8} O,_{18} A r,_{16} S,_{4} B e,_{2} H e$

Which of the above elements would you expect to be :

(i) very stable? (ii) in group 2 of the periodic table?

(iii) in group 16 of the periodic table ?

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.

Q. From the elements of the following atomic numbers

9, 12, 16, 20, 38, 47

56

, identify the elements that belong to same group in periodic table:

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