Answer:
They usually lose electrons to form ions with 2 positive charges
Explanation:
Answer: The nuclear equation is
.
Explanation:
A nuclear reaction in which a heavy particle splits into another particle along with release of energy is called a nuclear fission reaction.
For example, 
Here, energy is radiated in the form of gamma radiation.
Thus, we can conclude that the nuclear equation is
.
Answer:
Different materials have different densities. So it is False
Isotopes of same element has different number of neutrons with different masses and having same number of protons and electrons.
Radioactive isotopes are those isotopes which are radioactive in nature. The unstable nucleus results in the radioactivity process and this process will go on until the stable isotope (element) forms.
Thus, the nucleus of unstable isotopes of an element will decay leading to emission of radiation.