The Atom

What is at the center of every atom?

• An electron

• A compound

• A molecule

• A nucleus

Which two particles make up the nucleus of an atom?

• Protons and Electrons

• Protons and Neutrons

• Molecules and Compounds

• Neutrons and Electrons

In an atom, what is the number of protons equal to?

• The number of electrons.

• The number of neutrons.

• The number of molecules.

• The number of nuclei.

The particles with no charge in an atom are the _______.

• electrons

• neutrons

• protons

• protons and neutrons

Tags

NGSS.MS-PS1-1

What is the mass number?

• the number of protons

• the sum of the number of protons and the number of neutrons in the nucleus of an atom 

• the number of electrons

• the number of neutrons

Which of these determines the identity of an atom?

• proton

• neutron

• valence electron

• protons and neutrons

Most of an atom's mass is made up of:

• electrons and protons

• protons and neutrons

Tags

NGSS.MS-PS1-1

What particle is labeled A?

• proton

• electron

• neutron

Tags

NGSS.MS-PS1-1

What particle is labeled B?

• proton

• electron

• neutron

Tags

NGSS.MS-PS1-1

Which of these IS found in the nucleus?

• proton

• neutron

• electron

• protons and neutrons