Atoms & Chemical Reactions Unit 2 Test (updated 2024)

Front

What is the atomic symbol for Hydrogen?

Back

H

Front

How is an element defined in terms of atoms?

Back

An element is made up of all the same type of atoms.

Front

How many protons and electrons does Neon have?

Back

Neon has 10 protons and 10 electrons.

Front

How do electrons fill energy levels in Neon?

Back

2 in the first, and 8 in the second.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat.

Front

What is a covalent bond?

Back

A bond formed when atoms share electrons.

Front

What is the atomic number?

Back

The number of protons in an atom's nucleus.

Front

What is the atomic mass?

Back

The weighted average mass of an element's isotopes.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.