Unit 1: Atoms Test

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What charge does an ion with 11 protons and 10 electrons have?

Back

1+ (It has one more proton than electrons, resulting in a positive charge.)

Front

How many protons are in an atom of chlorine?

Back

17 protons.

Front

What is the Bohr model?

Back

The Bohr model is a diagram of an atom that shows electrons orbiting the nucleus in defined paths or energy levels.

Front

What is the correct Bohr model for oxygen?

Back

Model 2 (Oxygen has 8 electrons: 2 in the first shell and 6 in the second shell.)

Front

What is the mass number of an atom?

Back

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

Front

How do you calculate the mass number of an atom with 11 protons, 10 electrons, and 13 neutrons?

Back

Mass number = Protons + Neutrons = 11 + 13 = 24.

Front

What determines the overall mass of an atom?

Back

The overall mass of an atom is determined by the sum of its protons and neutrons.

Front

What is the charge of a neutral atom?

Back

A neutral atom has no charge, meaning it has an equal number of protons and electrons.

Front

What is the difference between protons, neutrons, and electrons?

Back

Protons are positively charged, neutrons are neutral, and electrons are negatively charged particles in an atom.