The number of electrons in the external energy level with a relative atomic mass of 23.

Atomic mass of matter = 23
According to the periodic table, this is Sodium
The number of all electrons is determined by the serial number of the element. Sodium – 11
Distribution of electrons
On the first energy. level is located 2ē
On the second – 8ē
For Sodium, the energy fields will look like this:
2ē 8ē 1ē
The outer energy level is the most extreme.
Therefore, for an element with a relative atomic mass, the number of electrons at the external energy level is 1ē