Question

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

The atom has 7 neutrons and 8 protons.
The atom has 7 electrons and 8 protons.
The atom has 8 neutrons and 7 electrons.
The atom has 8 electrons and 7 protons.

Answer 1

Step-by-step explanation:

protons = mass - neutrons

protons are plus so there are 8 protons.

mass = 15

8 = 15 - neutrons

-7 = - neutrons

neutrons = 7

The first two answers are the same and both are correct.