1
An atom with 17 protons, 17 electrons and 18 neutrons has a mass number
of ​

Explanation:

Mass number= 35 amu

35

Explanation:

mass number = protons in the nucleus + neutrons in the nucleus

17 + 18 = 35, the mass number

Protons and neutrons are together known as nucleons.

I would appreciate Brainliest, but no worries.

answerlinnaeus;