Question

How many valence electrons are in the outermost energy level of each of the following elements?

Helium


Lithium


Nitrogen


Magnesium

Answer 1

@Joel_the_boss

Answer 2

@j

Answer 3

Valance electrons are electrons which are found in the outermost energy level of the element.

Helium has only 2 electrons, so both are valence electrons.

Lithium has only 1 valence electron. The first ring of electrons is only able to have a maximum of 2 electrons, and lithium has 3. The remaining electron is carried over the the outermost energy level, making it a valence electron.

Nitrogen has 5 valence electrons.

Magnesium has 2 valence electrons.

Answer 4

^good answer.
Group number minus 10 for most of them is the number of valance electrons.