Fall Final (chem)

An atom that has an electric charge is called a(n)

• isotope

• ion

• molecule

• compound

Two isotopes of an element have different

• number of neutrons

• number of protons

• number of electrons

• atomic numbers

The number of protons in an atom's nucleus is called its

• atomic radius

• atomic number

• mass number

• charge

A chemical change must produce

• a gas

• a mixture

• a new substance

• the same substance

Iron (Fe) has a charge of 3⁺. Oxygen (O) has a charge of 2^-. What is the chemical formula when iron reacts with oxygen?

• Fe₂O₃

• Fe₃O₂

• O₂Fe₃

• O₃Fe₂

An aluminum atom has 13 protons in its nucleus. If this atom has a charge of 3⁺, how many electrons are present?

• 3

• 7

• 10

• 13

_____ is referred to as the distance between two peaks or troughs.

• wavelength

• frequency

• amplitude

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ is the electron configuration for which element?

• Na (sodium)

• Mg (magnesium)

• K (potassium)

• Ca (calcium)

1s² 2s² 2p⁶ 3s² 3p³ is the correct electron configuration for

• Al

• As

• P

• S

When writing electron configurations, what comes directly after "4s"?

• 4p

• 5s

• 4d

• 3d