Atom Flashcard

Front

What is the mass number of an atom?

Back

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

Front

What subatomic particle has a negative charge?

Back

The electron is the negatively charged subatomic particle.

Front

What does the atomic number of an element represent?

Back

The atomic number represents the total number of protons in the nucleus of an atom.

Front

Which subatomic particle contributes basically no mass to an atom?

Back

Electrons contribute basically no mass to an atom.

Front

How many protons are in an atom with an atomic number of 5?

Back

An atom with an atomic number of 5 has 5 protons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.