Answer:
Answer in explanation
Explanation:
To answer the question, we know that the atomic mass is the sum of the number of protons and neutrons. The number of protons equals the number of electrons in an electrically neutral atom. For positively charged ion, there is loss of electron, we subtract the charge from the number of protons. For negatively ion, there is a gain of electron, we add the charge to the number of protons
A 81Br- has gained one electron
P = 35
N = 81 - 35 = 46
E = 35 + 1 = 36
B. 63Cu2+ has lost 2 electrons
P = 29
N = 63 - 29 = 33
E = 63 - 2 = 61
C. 18O2- has gained 2 electrons
P= 8
N = 18 - 8 = 10
E = 8 + 2 = 10
D. 14C is electrically neutral P = E
P = 6
N = 14 - 6 = 8
E = 6
