CM 03.2TB Defining the Atoms

What is the basic unit of a chemical element?

• Molecule

• Atom

• Compound

• Mixture

An atom is the smallest unit of _______.

• energy

• matter

• light

• sound

Tags

NGSS.MS-PS1-1

What is the definition of an atom?

• A) A large molecule

• B) The smallest unit of an element

• C) A type of chemical bond

• D) A subatomic particle.

Which of the following is a subatomic particle that moves around the nucleus of an atom?

• Proton

• Neutron

• Electron

• Cathode ray

An atom is made of a nucleus containing protons and _______; electrons move around the nucleus.

• Neutrons

• Cathode rays

• Electrons

• Atoms

Tags

NGSS.HS-PS1-8

What is the smallest particle of an element that retains the properties of the element?

• Molecule

• Atom

• Electron

• Proton

What is the name of the ray of radiation that travels from the cathode to the anode when an electric charge is applied?

• Anode ray

• Cathode ray

• Electron ray

• Proton ray

Cathode rays are a stream of particles carrying a ______ charge.

• Positive

• Neutral

• Negative

• Variable

What is the function of the cathode in a cathode ray tube?

• To emit electrons

• To attract electrons

• To provide voltage

• To create a vacuum.

The mass of the charged particle discovered by J.J. Thomson was much less than a ______ atom, then the lightest known atom.

• helium

• oxygen

• hydrogen

• carbon