Chemical Formulas and Atomic Structure Test

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How do you calculate the total number of atoms in a chemical formula?

Back

Add the subscripts of all elements in the formula. For example, in H2SO4, there are 2 (H) + 1 (S) + 4 (O) = 7 total atoms.

Front

What is the charge of an atom?

Back

The charge of an atom is determined by the difference between the number of protons and electrons. If there are more protons, the atom is positively charged; if more electrons, negatively charged.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What are the three subatomic particles that make up an atom?

Back

Protons, neutrons, and electrons.

Front

What is a proton?

Back

A proton is a positively charged subatomic particle found in the nucleus of an atom.

Front

What is a neutron?

Back

A neutron is a neutral subatomic particle found in the nucleus of an atom.

Front

What is an electron?

Back

An electron is a negatively charged subatomic particle that orbits the nucleus of an atom.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed when two atoms share one or more pairs of electrons.