Atoms Basics

Front

What is the mass number of an atom?

Back

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

Front

What is the smallest part of an element that retains the chemical identity of the element?

Back

The smallest part of an element that retains its chemical identity is an atom.

Front

What particle has a mass of 1 amu and a charge of +1?

Back

A proton has a mass of 1 amu and a charge of +1.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What particle has a mass of 1 amu and a charge of 0?

Back

A neutron has a mass of 1 amu and a charge of 0.

Front

What is an electron?

Back

An electron is a subatomic particle with a negligible mass and a charge of -1.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is an isotope?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

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.