Indicate the total number of electrons in the external energy level and the number of energy levels in the atoms of the elements

Indicate the total number of electrons in the external energy level and the number of energy levels in the atoms of the elements of the following groups:
a) alkali metals;
c) halogens;
b) alkaline earth metals;
d) noble gases.

a) alkali metals; One electron at the outer energy level, the number of energy levels from 1 to 7.
c) halogens; Seven electrons in the outer energy level, the number of energy levels from 1 to 7.
b) alkaline earth metals; Two electrons in the outer energy level, the number of energy levels from 1 to 7.
d) noble gases. Eight electrons (two for Helium) at the external energy level, the number of energy levels from 1 to 7.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.