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Answer: A is in group 1A
B is in group 3A
C is in Group 5A
D Is in group 7A
Explanation:
When B and D combine the formula becomes BD3
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It is stated that electrons are distributed in three shells, thus the atoms are of third period.
In 3rd period, atom having 1 valence electron is sodium (A), atom having 3 valence electrons is aluminium (B), atom having 5 valence electrons is phosphorus (C), atom having 7 valence electrons is chlorine (D).
Thus A lies in group 1, B lies in group 13, C lies in group 15 and D lies in group 17.
On combining B and D the formula will be AlCl3.
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