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An element 'x' has same number of electrons in the first and the fourth shell as well as in the second and the third shell.

Q. 'x' মৌলৰ প্ৰথম আৰু চতুৰ্থ খোলত সমান সংখ্যক ইলেক্ট্ৰন আছে আৰু সেইদৰে দ্বিতীয় আৰু তৃতীয় খোলত থকা ইলেক্ট্ৰনৰ সংখ্যাও সমান-
An element 'x' has same number of electrons in the first and the fourth shell as well as in the second and the third shell. 

(ক)  মৌলৰ ইলেক্ট্ৰনীয় বিন্যাস লিখা। Write down the electronic configuration of the element  'x'.
(খ) 'x' মৌলটোৰ বৰ্গ আৰু পৰ্যায় উল্লেখ কৰা। Write down the group number and the period to which its belongs.
(গ) মৌলটোৰ যোজ্যতা কিমান? What is the valency of the element?
Ans: (ক) 2.8.8.2
         (খ) বর্গ =2, পর্যায় =4
         (গ) 2

Electronic configuration :- 2,8,8,2
Group : 2
Period : 4
Valency : 2

Or
Q. An element 'X' has same number of electrons in the first and the fourth shell as well as in the second and the third shell.
(a) write down the electronic configuration of the element 'X'.
(b) write down the group number and the period to which it belongs.
(c) what is the valency of the element?​ 
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