Question

R

3. If an atom has 17 protons, 18 neutrons, and 17 electrons, what is the mass of
the atom?
A.
17
B.
18
C.
35
D.
52
Explanation

Answer 1

C.) 35

Step-by-step explanation:

The mass is made up of the total protons and neutrons in an atom. Protons and neutrons both have a mass of 1 amu. Electrons are not included in this measurement because they have an insignificant mass (practically 0).

(17 protons x 1 amu) + (18 neutrons x 1 amu) = 35 amu

Therefore, if an atom contains 17 protons and 18 neutrons, the mass should be 35 amu.