It has 20 neutrons and 20 protons.
mass energy and binding energy
A nucleas is something in an atom.
The nucleus contains protons (which carry a positive charge) and neutrons (which do not carry any charge)
Yes
Calcium oxide (CaO) contain one atom of calcium.
In the nucleas
protrons, neutrons, electrons
A nucleas holds chromatin which contain genetic material. It gives you your genes that describe your personality and features.
they are the outermost electrons orbiting the nucleas
In the nucleas. Ray
The Mass Number.
They orbit around the nucleas of an atom, except in hydrogen atoms, which does not contain electrons at all.