Which particles have the same mass?
a. proton and electron
b. proton and neutron
c. electron and neutron

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

b) nuclear ive learned that in a pedtrodic table