Question

An element with mass number 40 is represented as 40Xz. The element
X has 18 electrons. [4x 0.5+1=3]
State:
(a) Atomic number of X
(b) Number of protons
(c) Number of neutrons
(D) Valency of X
(E) Also draw the atomic structure of X.

Answer 1

Answer:

atomic number = no. of electrons (neutral)

= no. of protons