First Semester Test Review--Part 2

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.

Front

What are the three main subatomic particles?

Back

The three main subatomic particles are protons (positively charged), neutrons (neutral), and electrons (negatively charged).

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 atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). It is approximately equal to the number of protons plus neutrons.

Front

Where are electrons located in an atom?

Back

Electrons orbit the nucleus of an atom in energy levels or shells.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together in a fixed ratio.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Front

What is the charge of a proton?

Back

A proton carries a positive charge.

Front

What is the charge of an electron?

Back

An electron carries a negative charge.