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asked Jul 3, 2022 193k views

2 Answers

JoseM · Answer 1 · 2022-07-06T15:27:41+0000

Answer

A

step by step explanation

because an element that is 3rd period and 2 group is mg. mg has atomic number of 12 and electron per shell k=2,l=8,m=2

Alexandr Panteleev · Answer 2 · 2022-07-09T19:36:41+0000

Answer:

3 Shells and 2 valence electron

Step-by-step explanation:

Groups are determined by valence electron of element

Period of element is determine by number of shells occupied by electrons