Atomic Theory

Front

What did Niels Bohr prove about electrons?

Back

Electrons are in energy levels.

Front

Which statement about the nucleus is incorrect?

Back

The nucleus is involved in chemical reactions.

Front

What is the charge of neutrons?

Back

Neutrons have a neutral charge.

Front

What does it mean if an atom has an equal number of protons and electrons?

Back

The atom is electrically neutral.

Front

Which statement about Dalton's atomic theory was proven wrong?

Back

All elements are made up of tiny indivisible particles called atoms.

Front

What are the three main subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Protons carry a positive charge.

Front

What is the mass of an electron compared to protons and neutrons?

Back

Electrons have a very small mass compared to protons and neutrons.

Front

What is an isotope?

Back

Isotopes are atoms of the same element with different numbers of neutrons.

Front

What is the role of the nucleus in an atom?

Back

The nucleus contains protons and neutrons and is the center of the atom.