Acid formulas usually start with because they have hydrogen atoms combined with other atoms in their molecules

H

Explanation:

Example,

HCl for hydrochloric acid

H2SO4 for sulphuric acid

HNO3 for nitric (v) acid

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

i think it is d. e because the next one is igneous.