Unit 3 Practice Test

Front

What are isotopes?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

What is the atomic number?

Back

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

Front

What is a positive ion?

Back

A positive ion, or cation, is formed when an atom loses one or more electrons, resulting in a net positive charge.

Front

What is radioactivity?

Back

Radioactivity is the spontaneous emission of particles or radiation from the nucleus of an unstable atom.

Front

What do isotopes of an element have in common?

Back

Isotopes of an element have the same atomic number and the same number of electrons.

Front

What is an electron?

Back

An electron is a negatively charged subatomic particle that orbits the nucleus of an atom.

Front

What is a neutron?

Back

A neutron is a neutral subatomic particle found in the nucleus of an atom, contributing to the atomic mass.

Front

What is a mass number?

Back

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

Front

What is a negative ion?

Back

A negative ion, or anion, is formed when an atom gains one or more electrons, resulting in a net negative charge.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total count of protons and neutrons in a specific isotope.