Which statement correctly describes part of the atomic model?
a. atoms are made only of protons and electrons.
b. the nucleus is made of protons and electrons.
c. protons are outside the nucleus.
d. electrons are outside the nucleus

D

Explanation:

In an atomic model of an atom, the nucleus consists of protons and neutrons while the electrons revolves round its orbitals outside the nucleus. The protons are positively charged while the electrons are negatively charged so as to counter electric charges and make the atom electrically neutral.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume