23. Two elements P and Q belong to third period of modern periodic table and are
present in group 1 and group 2. Compare and make a table of their following
characteristics.
(i) The number of electrons in their atoms.
(ii) The formula of their oxides.
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Answer:
Group 1 Group 2
a) One electron in the valence shell Two electrons in the valence shell
b) Larger atomic size compared to Group 2 Smaller atomic size compared to Group 1
c) More metallic in nature Comparatively less metallic
d) Highly electropositive, readily loses electron Comparatively less electropositive
e) Oxide formula: X
2
O Oxide formula: XO
f) Chloride formula: XCl Chloride formula: XCl
2
Explanation:
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