Chemistry
An element X has atomic number 12. Answer the following questions:
(a) State the period and group to which it belongs.
(b) Write the formula of the compound formed between X and the second member of the halogen group
Periodic Table
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Answer
(a) Atomic number 12 corresponds to the electronic configuration 2, 8, 2.
- Period: three occupied shells → Period 3.
- Group: two valence electrons → Group 2 (alkaline earth metals).
(b) Second member of halogen group is chlorine. Element X has valency 2, and Chlorine has valency 1. So, the formula will be MgCl2.
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