The Atom and Bohr Models

Front

What is an atom?

Back

The smallest unit of matter that retains the properties of an element.

Front

What is the nucleus of an atom?

Back

The central part of an atom, containing protons and neutrons.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element.

Front

What is the mass number?

Back

The total number of protons and neutrons in an atom's nucleus.

Front

What is a valence electron?

Back

An electron in the outermost shell of an atom that can participate in chemical bonding.

Front

What does the period number in the periodic table indicate?

Back

The number of energy levels or shells in an atom.

Front

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

Back

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