Atomic Structure

Front

What is the tiny but very dense, positively charged portion of the atom that holds most of the atomic mass?

Back

Nucleus

Front

What do you call atoms of the same element with a different number of neutrons?

Back

Isotope

Front

How many neutrons does a sodium atom have if its mass number is 23 and atomic number is 11?

Back

12

Front

What is the calculation used to find the number of neutrons in an atom?

Back

Mass Number - Atomic Number

Front

What are subatomic particles with a positive charge?

Back

Protons

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What is an electron?

Back

A subatomic particle with a negative charge that orbits the nucleus.

Front

What is the electron cloud?

Back

The region around the nucleus where electrons are likely to be found.

Front

What is an ion?

Back

An atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.