Question 1

Which statement describes the earliest model of the atom?

Accepted Answer

An atom is an indivisible hard sphere.

Answer

Electrons in an atom have wave-like properties.

Answer

Electrons are negative particles in an atom.

Answer

An atom has a small, dense nucleus.

Question 2

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

Accepted Answer

number of protons

Answer

number of neutrons

Answer

sum of the number of neutrons and protons

Answer

difference between the number of neutrons and protons

Question 3

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

Accepted Answer

p

Answer

α

Answer

β-

Answer

β+

Question 4

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

Accepted Answer

an electron

Answer

a positron

Answer

a neutron

Answer

an alpha particle

Question 5

Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?

Accepted Answer

4

Answer

3

Answer

2

Answer

1

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