Question

The electronic configuration of an element with
atomic number 20 is
A
2, 8, 10
B
2, 8, 8, 2
C
2, 8, 2, 8
D
2, 2, 8, 8​

Answer 1

Answer:

The answer is B

2,8,8,2

The first shell of an atom can only accomodate 2 electrons

The shells after the first one can accommodate 8 electrons max.

And in the last shell u also put the number af electrons left, if less than 8.

Answer 2

Answer:

2,8,8,2 is write answer

Explanation:

In first shell have 2 electron.

In second shell have 8 electron.

It is rule that outer shell always have 2 electrons

So, third shell have 8 and forth have 2 electrons