Question

A neutral atom possesses an atomic number of 15 and an atomic mass of 31. Three electrons are gained. What is the result of this conversion?
A. a positively charged ion

B. a new isomer of the element

C. a new isotope of the element

D. a negatively charged ion

Answer 1

Answer:

D. a negatively charged ion

Explanation:

In the neutral state of any element the number of electrons and number of protons are equal in the number. Here in this case since number of electrons are 15 ( equal to atomic number) therefore number of protons are also 15. When 3 electrons are gained by the element this results in a  a negatively charged ion. The ion will have -3 charge over it. It either means excess of three electrons or deficiency of three protons.

Answer 2

On a neutral state, the number of proton of a substance will be equal to the number of its electron (in this case, it has 15 electrons). When three electrons are gained, the total number of the electron will change to 18.

Therefore this result in the substance becomes - D. A negatively charged ion of 3-

Hope this helps!