Question

question 16 of 25
how is the atomic number related to core electrons?
a. the atomic number plus the group number is the number of core electrons.
b. the atomic number minus the period number is the number of core electrons.
c. the atomic number is equal to the number of core electrons.
d. the number of valence electrons plus core electrons is the atomic number.

Explanation:

The atomic number of an element is equal to the total number of electrons in a neutral atom. Electrons are divided into valence electrons (outer - most electrons involved in chemical bonding) and core electrons (inner - shell electrons). So, the sum of valence electrons and core electrons gives the total number of electrons, which is equal to the atomic number.

Answer:

D. The number of valence electrons plus core electrons is the atomic number.