α - particles consists of high energy particles carrying
1) 2 units of positive charge and 2 units of atomic mass
2) 1 units of positive charge and 2 units of atomic mass
3) 2 units of positive charge and 1 units of atomic mass
4) 2 units of positive charge and 4 units of atomic mass
1) 2 units of positive charge and 2 units of atomic mass
2) 1 units of positive charge and 2 units of atomic mass
3) 2 units of positive charge and 1 units of atomic mass
4) 2 units of positive charge and 4 units of atomic mass