An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?
- 1718W
- 1817W
-
3517W
- 3518W
The correct answer is: C
Explanation
The superscript is the atomic mass = 35
(The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons)
The subscript is the atomic or proton number = 17
The number of electrons in a neutral atom is equal to the number of protons.