Atomic Structure Review

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

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Number of protons.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of the group number in the periodic table?

Back

The group number indicates the number of valence electrons in the elements of that group.

Front

What is the difference between protons and electrons?

Back

Protons are positively charged particles found in the nucleus, while electrons are negatively charged particles that orbit the nucleus.

Front

Who proposed the planetary model of the atom?

Back

Niels Bohr proposed the planetary model of the atom, where electrons orbit the nucleus in defined paths.

Front

What is an isotope?

Back

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

Front

How does the atomic mass of an element relate to its isotopes?

Back

The atomic mass is a weighted average of the masses of all the isotopes of an element, based on their natural abundance.

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus by offsetting the repulsive forces between positively charged protons.