Atoms and Isotopes Review

Which statement describes the earliest model of the atom?

• The atom is an indivisible hard sphere

• An atom has a small, dense nucleus.

• Electrons are negative particles in an atom.

• Electrons in an atom have wave-like properties

In all atoms of bismuth, the number of electrons must equal the

• number of protons

• the number of neutrons

• sum of the number of neutrons and protons

• difference between the number of neutrons and protons

Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?

• a

• B-

• B+

• p

Tags

NGSS.HS-PS1-8

An orbital is a region in an atom where there is a high probability of finding

• an alpha particle

• an electron

• a neutron

• a positron

Which element is classified as a metalloid?

• boron

• potassium

• sulfur

• xenon

Which notations represent atoms that have the same number of protons but a different number of neutrons

• H-3 and He-3

• S-32 and S-32

• Cl-35 and Cl-37

• Ga-70 and Ge-73

Which particles are found in the nucleus of an argon atom?

• protons and electrons

• positrons and neutrons

• protons and neutrons

• positrons and electrons

The mass of an electron is

• equal to the mass of a proton

• equal to the mass of a neutron

• greater than the mass of a proton

• less than the mass of a proton

• less than the mass of a neutron

Which substance can not be broken down by a chemical change?

• ammonia

• magnesium

• methane

• water

The results of the gold foil experiment led to the conclusion that an atom is

• mostly empty space and has a small, negatively charged nucleus

• mostly empty space and has a small, positively charged nucleus

• a hard sphere and has a large, negatively charged nucleus

• a hard sphere and has a large, positively charged nucleus

Tags

NGSS.HS-PS1-8