Al- 28
B- 11
C- 14
Sc- 46
Na- 24
Mass number= proton+neutrons
The wrong one is
<span>radioactive half-life is increased by heating the isotope.</span>
Riley can either change the surface area of the object or can change the slipperiness of the material.
Alpha particle has a mass of 4 (Two protons and two neutrons)
Neutron has a mass of 1
Beta particle has a mass of about 0 (Electron)
Proton has a mass of 1
So the answer is (2) Beta particle