Answer:
C
Explanation:
It afffects changes in pressure and temperature not melting and boiling points
Atomic Number is the same as the number of protons in an element.
Mass Number is the number of Protons + Neutrons in an element.
Atomic Number: 6 means 6 Protons
Mass Number: 15 means 15 atoms that are a proton/neutron.
We are given out of the 15 atoms, 6 of them are protons, so the other 9 must be Neutrons.
15 - 6 = 9 so there must be 9 Neutrons.
There are 9 Neutrons in atom's nucleus.
Give Brainiest if you think this is the best answer and explanation. Thanks!
So it contains three protons and four neutrons
