Question

group number,period number, familiar ly name of 12 mg and 18 Ar ​

Answer 1

The electronic configuration of the element with atomic number 12 is 1s²2s²2p⁶3s²

The number of valence electrons =2, which means it belongs to group II A.

The valence shell is 3, which means it belongs to the third period.

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Answer 2

Question:-

group number,period number, familiar ly name of 12 mg and 18 Ar

Answer:-

Atomic number increases as you move down a group or across a periodPeriods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table.

Given:-

$35.453 = chlorine \: \: \: \: 17$