Answer
(a) Neutral -- A, F, G
(b) Negatively charged -- B, E
(c) Positively charged -- C, D
(d) Please see attached.
Work Step by Step
Important to remember:
Proton - positively charged
Electron - negatively charged
Neutron - neutral
To determine the charge, we simply subtract the electron from the proton count:
A) 5 - 5 = 0 (neutral)
B) 7 - 10 = -3 (negatively charged)
C) 19 - 18 = 1 (positively charged)
D) 30 - 28 = 2 (positively charged)
E) 35 - 36 = -1 (negatively charged)
F) 5 - 5 = 0 (neutral)
G) 9 - 9 = 0 (neutral)
The symbol of an element is written with the mass number (# of protons + # of neutrons) on the upper left side, the atomic number (# of protons) on the lower left side, and the charge on the upper right side. The atomic number shows us the identity of the element (consult the periodic table of elements).
