Question

an ion Y3+ has 18 electrons and 24 neutrons. Determine the proton number and nucleon numbe.r of the element Y

Answer 1

A neutral atom has the same number of protons and electrons. Anytime an element  has a charge, that means either more electrons or protons were added.
more electrons= negative charge
more protons = positive charge
Your charge is +3 which means there are 3 more protons than electrons
First answer is proton number is 21
The nucleon number means mass number which is protons + neutrons
24 + 21 = 45
Nucleon number is 45

Answer 2

Answer: The proton number of the element is 21 and the nucleon number is 45

Explanation:

We are given:

A chemical ion having symbol $Y^{3+}$

Charge on the ion = + 3

Number of electrons = 18

Number of neutrons = 24

We know that:

Charge = Number of protons - Number of electrons

Number of protons = 18 + (+3) = 21

Nucleons are defined as the sub-atomic particles which are present in the nucleus of an atom. Nucleons are protons and neutrons.

Number of nucleon in the element = 21 + 24 = 45

Hence, the proton number of the element is 21 and the nucleon number is 45