What is at the center of every atom?

• An electron

• A compound

• A molecule

• A nucleus

Tags

NGSS.HS-PS1-8

Which two particles make up the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Molecules and Compounds
• Neutrons and Electrons

Tags

NGSS.MS-PS1-1

What is the role of an electron in an atom?

• Electrons live inside the nucleus and carry a neutral charge.
• Electrons circle the nucleus and have a positive charge.
• Electrons circle the nucleus and have a negative charge.
• Electrons live inside the nucleus and have a negative charge.

In a neutral (no charge) 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.

Which of the following determines the type of element that an atom makes?

• The size of the nucleus.
• The number of protons.
• How much the atom weighs.
• The number of neutrons.

Tags

NGSS.HS-PS1-1

A proton is a _____ charged particle.

• Negatively
• Positively

An electron is a _____ charged particle.

• Positively
• Negatively

Tags

NGSS.MS-PS2-3

What is an atomic number?

• The sum of protons and neutrons in an atom.
• The sum of protons and electrons in an atom.
• The number of protons in an atom of a specific element.
• The number of neutrons in a specific element.

The number of neutrons equals...

• atomic number - mass number

• Protons - neutrons

• Electrons - protons

• mass number - atomic number

Tags

NGSS.MS-PS1-1

The atoms of any given element ____ have the same number of protons.

• sometimes
• always
• never