Hydrogen bromide is a chemical compound. It’s formed from atoms of hydrogen and bromide, two A
electrons.

B
elements.

C
neutrons.

D
nuclei.

The correct option is B. elements.

Explanation:

A chemical compound is defined as the specie which is formed by the combination of two or more elements. For example: Water, carbon dioxide, etc..

Elements is defined as the chemical specie which consists of only one type of atom. For example: Hydrogen, Oxygen, etc..

Now, when hydrogen element and bromine element combines, it leads to the formation of a heteronuclear chemical compound known as hydrogen bromide having chemical formula HBr.

Hence, the correct option is B. elements.

h

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.