Atomic Structure & History

Front

What are the positive particles of an atom called?

Back

Protons

Front

What experiment led to the conclusion that atoms have a small, dense nucleus?

Back

Rutherford’s gold foil experiment

Front

According to Dalton's Atomic Theory, what are the indivisible units that make up all elements?

Back

Atoms

Front

What is the central region of an atom where neutrons and protons are located?

Back

Nucleus

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

What is the mass of a proton compared to an electron?

Back

A proton is approximately 1836 times more massive than an electron.

Front

What does the term 'atomic mass' refer to?

Back

The weighted average mass of an element's isotopes.

Front

What is an isotope?

Back

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