Physical Science - 3rd Edition - Module 3

Who was the first to argue that all matter was made from indivisible particles called atoms?

• Democritus

• Thomsen

• Dalton

• Bohr

Which of the following is NOT part of John Dalton's atomic theory?

• All elements are composed of atoms.

• All atoms of the same element have the same mass.

• Atoms are made of subatomic particles.

• Compounds are made of atoms of more than one element.

Which is NOT true of the Law of Conservation of Mass?

• Matter cannot be created.

• Matter cannot be destroyed.

• Matter can change forms.

• Matter can be created in a specialized chemical reaction.

In Rutherford's atomic model with a nucleus, the positive charge is concentrated in the center of the atom.

• True

• False

Which subatomic particle has a negative charge?

Which statement about subatomic particles is true?

• Neutrons have no charge and no mass.

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

Protons and neutrons have almost the same mass.

• True

• False

Protons and electrons have the same charges.

• True

• False

Which of the following is unique for each element?

• the number of electrons

• the number of protons

• the number of neutrons

Which statement is false?

• An electron has the same amount of energy in every orbital.

• An orbital can contain a maximum of two electrons.

• An electron cloud represents all the orbitals in an atom.

• An atom's lowest energy level has only one orbital.