Atom 8th grade

1. What is the basic unit of matter and is considered as the smallest unit

of an element?

• A. Atom

• B. Electron

• C. Neutron

• D. Proton

Refer to the picture, which part is negatively charged particle?

• Part A

• Part B

• Part C

• Part A and B

Tags

NGSS.MS-PS1-1

Refer to the illustration , which part would determine the mass of an atom and is collectively known as "nucleus"?

• A only

• A and B

• B and C

• C only

Tags

NGSS.MS-PS1-1

What are the three subatomic particles?

• A. Proton, Neutron, and Hydrogen

• B. Nucleus, Proton, and Neutron

• C. Proton, Neutron, Electron

• D. Proton, Ion, and Electron

5. Who developed the Atomic Theory of matter?

• A. Antoine Lavoisier

• B. John Dalton

• C. Ernest Rutherford

• D. Joseph Proust

Which statement about subatomic particles is TRUE?

• A. Protons, Electrons, and Neutrons all have the same mass

• B. An electron has less mass than either a proton or neutron

• C. Unlike protons or neutrons, electrons have no mass.

• D. Neutrons have no charge and no mass

Tags

NGSS.HS-PS1-8

7. The mass number of the atom can be obtained by _________.

• A. Adding the protons and the electrons

• B. Adding the electrons and neutrons

• C. Determining the number of protons only

• D. Adding the number of protons and neutrons

The atomic number of an element is equal to _________.

• A. The number of protons in an atom

• B. The number of neutrons in an atom

• C. The number of protons plus the number of electrons in the atom

• D. The number of protons plus the number of neutrons in the atom

To determine the number of neutrons in the nucleus of a neutral atom,

you have to subtract ________.

• A. Its mass number from its atomic number

• B. Its atomic number from its mass number

• C. Its mass number from its electron number

• D. Its atomic number by its electron number

The identity of an element is determined by _____________.

• A. The number of its protons

• B. The number of its neutrons

• C. Its atomic mass

• D. The number of its electrons