Question

(a)Atomic number of mg and al are 12 and 13 respectively. Write down their electronic configuration.
(b)mention the period of the modern periodic table to which the above two elements belong. Give reason for your answer. Need answer quick plz

Answer 1

(a)Magnesium atomic number 12,electronic configuration 2,8,2 
Aluminium atomic number 13,electronic configuration 2,8,3 

(b)Magnesium belongs to 3 period and aluminium also belongs to 3 period as their are three shells only filled (K,L,M). Hence, they belong to 3 period.

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