Question
Sat December 17, 2011 By:
 

Respected Mam, my question is, 'x' is an element with atomic number 20. How is the formula of its chloride given? Please explain in simple words so I can understand it

Expert Reply
Sat December 17, 2011
The element x has atomic number 20, so it has 20 protons and 20 electrons. So, the electronic configuration will be 1s2  2s2  2p6  3s2  3p6 4s2
This suggests the element belongs to group 2.
It can easily lose the outermost 2 electrons to form a +2 ion. Chloine on the other hand needs one more electron to form its octet. Therefore, two chlorides can form bond with this +2 ion. So, it will form bond with two chlorides.
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