In the (a)   of atom, there are protons and neutrons.

This picture is the example of (a)  

This picture is the example of (a)  

The atomic number of Ge (a)  

The mass number of Ge ...

(a)  

The number of electron of atom Ge (a)  

The number of neutron of atom Ge (a)  

The number of proton of atom Ge (a)  

The maximal number of electron in the first shells (K shells) (a)  

The maximal number of electron in the second shells (L shells) (a)  

The maximal number of electron in the third shells (M shells) (a)  

The maximal number of electron in the fourth shells (N shells) (a)  

The maximal number of electron in the fifth shells (O shells) (a)  

The electron configuration of atom Ge (a)  

The valence electron of atom Ge (a)  

Atoms with fewer than 4 valence electrons will form a postitive ion. We can called it (a)  

Elements with greater than 4 valence electrons will form anions or (a)   ion

A metal atom is to lose electrons to form a (a)  

A nonmetal atom is to gain electrons to form a (a)