Question

how would you justify the presence of 18th element in the 5th period of the periodic table ​

Answer 1

Explanation:

While filling 5th shell according to aufbau principle 5s,5p.4d filled so 2 +6 +10 =18 electrons or elements are present in 5th shell. We start the 5th period with 4s orbital. We can add 2 electrons in 4s.

Answer 2

Explanation:

While filling 5th shell according to aufbau

principle 5s,5p.4d filled so 2 +6 +10 =18

electrons or elements are present in 5th shell.

We start the 5th period with 4s orbital. We can

add 2 electrons in 4s.