A(n) is a variety of an element with the same number of protons and electrons as the other types of the element but a different number of neutrons.

The answer to your question is Isotope

Explanation:

Isotopes are atoms with the same number of protons and electrons but their atomic mass is different due to their number of neutrons is different.

In this kind of elements, the number of protons stays the same.

Some isotopes are radioactive but others do not.

Some isotopes are used to know the age of fossils or ancient things.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

mark brainliest and have a great day!