What are the smallest units of an element that still have all the properties of that element?

• Atoms

• Molecules

• Compounds

• Ions

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which subatomic particle has a positive charge and is found in the nucleus?

• Proton

• Neutron

• Electron

• Photon

What defines an element according to the passage?

• Number of protons

• Number of neutrons

• Number of electrons

• Atomic mass

In the Bohr model, where are electrons shown?

• In energy levels around the nucleus

• Inside the nucleus

• Randomly scattered

• In fixed positions

Which subatomic particle has almost no mass?

• Electron

• Proton

• Neutron

• Photon

What charge do neutrons have?

• Neutral

• Positive

• Negative

• Variable

What is the atomic number of an element based on?

• Number of protons

• Number of neutrons

• Number of electrons

• Total mass

What is a pure substance?

• A substance with only one type of atom or molecule

• A mixture of different substances

• A substance that changes its form

• A substance that produces light

Which of the following is an example of a mixture?

• Oxygen

• Air

• Water

• Gold

What happens during a physical change?

• The substance changes its identity

• Atoms rearrange to form new substances

• The form or appearance changes without changing the substance

• A solid is formed