Question

How many valence electrons are in an atom with the electron configuration in example A? Example A: 1s22s22p63s23p64s1

Answer 1

The total number of electrons that each shell can hold is: Shell 1 - has subshell s, which has one orbital. It can therefore hold2 electrons. Shell 2 - has subshells s and p. p has 3 orbitals, so can hold 6 electrons.

Answer 2

In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

for neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.

Valence electrons are the electrons located at the outermost shell of an atom. ... For the oxygen atom, you can see that the outermost shell has 6 electrons, so oxygen has 6 valence electrons. Neon's outermost shell has 8 electrons.