Chemistry Final Review

Particles in an atom that are neutral and have no charge are 

• ions 

• electrons 

• neutrons 

• protons 

Answer explanation

Neutrons are the particles in an atom that are neutral and have no charge, unlike electrons and protons which are charged particles.

If the number of protons equal the number of _____, the atom will have no charge

• protons

• neutrons

• electrons

• nucleus

Answer explanation

If the number of protons equal the number of electrons, the atom will have no charge. Therefore, the correct choice is electrons.

The subatomic particle with a negative charge is the

• electron

• proton

• neutron

• nucleus 

Answer explanation

The subatomic particle with a negative charge is the electron, as electrons are negatively charged particles found in atoms.

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

Answer explanation

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

What is the mass number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

Answer explanation

The mass number is the number of protons and neutrons in an atom. It does not include the number of electrons.

An atom with an unequal number of protons and electrons is said to be a(n) ___.

• radioactive particle

• isotope

• ion

• molecule

Answer explanation

An atom with an unequal number of protons and electrons is called an ion, which is the correct choice in this context.

Ions are: 

• atoms with a positive or negative charge

• atoms with no charge

• atoms with ONLY a positive charge

• atoms with ONLY a negative charge

Answer explanation

Ions are atoms with a positive or negative charge, making the correct choice atoms with a positive or negative charge.

How many neutrons does the isotope of lithium have?

• 8

• 3

• 4

• 5

Answer explanation

The isotope of lithium has 5 neutrons, which is the correct answer choice.

Tags

NGSS.MS-PS1-1

How many protons does this isotope of titanium have?

• 48

• 22

• 26

• 70

Answer explanation

This isotope of titanium has 22 protons, which is the correct answer choice provided.

Tags

NGSS.MS-PS1-1

The state(s) of matter that takes the shape of its container is....(Choose the BEST answer)

• Gas

• Solid

• Liquid/Gas

• Liquid

Answer explanation

The state of matter that takes the shape of its container is liquid.