Question

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?​

Answer 1

Answer:

We know that mass number= number of protons+number of neutrons in any given atom. Here, mass number is 27 and there are 14 neutrons hence protons=27-14=13. In a neutral atom, number of protons=number of electrons. Hence in this case the number of electrons in the neutral atom will be 13. Now, since the atom carries +3 charge hence it will have 13-3=10 electrons. By the way the atom mentioned here is Aluminium (Al) and thus the cation will be Al3+.

Answer 2

Answer: e=10

Explanation:

Number of valence electrons= +3

This shows that atom had lost 3 electrons to become stable and reach the state of octet.

number of neutrons= 14

Mass number= 27

Number of electrons= 27-14

=13

so the number of electrons in the ion= 13-3

=10