How many valence electrons does a neutral atom of beryllium have

A neutral Beryllium atom has two (2) valence electrons

Explanation:

Beryllium, Be, is a group 2 element on the periodic table. Its atomic number is 4.

Generally, atomic number equals number of electrons, which means a neutral Beryllium atom contains four (4) electrons: two (2) in the inner shells and 2 in the outer shell (valence electrons), which can take part in a chemical reaction and participate in chemical bonding.