Question

blewis@stu.kountzeisd.org
which of the following best defines valence electrons? *
electrons in the innermost energy level of an atom.
electrons in the outermost energy level of an atom that are involved in chemical bonding.
all the electrons present in a neutral atom.
electrons that are tightly bound to the nucleus and do not participate in bonding.
how many valence electrons does an atom of nitrogen (atomic number 7) * possess?
3
5
2
7

Explanation:

Valence electrons are defined as the electrons in the outermost energy level of an atom that are involved in chemical bonding. For nitrogen (atomic number 7), its electron - configuration is 1s²2s²2p³. The electrons in the 2s and 2p orbitals (a total of 5 electrons) are in the outermost shell and are valence electrons.

Answer:

1. Electrons in the outermost energy level of an atom that are involved in chemical bonding.
2. 5