Chemistry

Mass Number

Atomic Number

Vocabulary

Subatomic Particles

Charges

100

12 protons, 14 neutrons

What is the mass number?

100

28 protons, 32 neutrons

What is the atomic number?

100

Define an atom.

The smallest unit of matter with unique characteristics.

100

What are the three subatomic particles?

protons, neutrons, and electrons

100

How do you determine the charge of an atom?

By subtracting the number of electrons from the number of protons.

200

³⁸₁₈Ar

What is the mass number?

200

¹⁷₉F

What is the atomic number?

200

Define the nucleus of an atom.

The center of the atom containing protons and neutrons.

200

What is the charge of each subatomic particle?

protons +

neutrons =

electrons -

200

What charge does a cation have? An anion?

Cation = positive

Anion = negative

300

How to solve for mass number?

protons + neutrons

300

Can the number of protons in an atom change?

NOOOOOO no no no no no NO

300

Define an element.

A substance consisting only of atoms with the same number of protons.

300

How do you determine the number of protons in an atom?

By using the atomic number off the periodic table.

300

How do cations and anions get their charge?

Cations have less electrons than protons; anions have more electrons than protons.

400

What is the mass number for a stable carbon atom?

400

How do you find the atomic number?

Look at the whole number on the periodic table.

400

Define an ion.

An atom, or group of atoms, that are positively or negatively charged due to a change in the number of electrons.

400

How do you determine the number of neutrons in an atom?

By subtracting the number of protons from the mass number. If no mass number, then assume neutrons are equal to protons.

400

In general, what charge do metals have? Nonmetals?

Metals = positive

Nonmetals = negative

500

How many neutrons in Antimony-122?

500

What is the atomic number for the largest alkaline earth metal?

500

Define an isotope.

An atom with a different number of neutrons than protons, causing a change in the mass number.

500

How do you determine the number of electrons in an atom?

By subtracting the charge from the number of protons. If no charge is provided, assume the electrons are equal to the protons.

500

Solve the following charges:

12 protons, 10 electrons

15 protons, 18 electrons

36 protons, 36 electrons

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