When two or more atoms chemically combine, they make a 1.mass
2.mono atom
3.molecule
4.synthesis

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.

dipole moments occur when there is a separation of charge. they can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity. the dipole moment is a measure of the polarity of the molecule.

explanation:

in inorganic chemistry -dipole moment ( μ ) is the measure of net molecular polarity, which is the magnitude of the charge q at either end of the molecular dipole times the distance r between the charges. μ = q × r.