Question

18 an element X has three electron shells with 5 electrons outermost shell, Predict the following
about the element
A The period in which it is located.
B. The group in which it is located.
cits atomic number.​

Answer 1

Answer:

A..3rd period

B...5th group

Explanation:

from shell number we can predict the period number

and number of valance electrons are equal to group number