HC Unit 2B Test Review

1. Which of the following are properties of metals?

• 1. Brittle or soft

• 1. Conduct electricity only when dissolved in water or melted

• 1. Ductile

• 1. Dull (non-reflective)

1. Which group represents particles that contain the same number of electrons?

• 1. F, Ne, Na

• Mg, Al, Si

• Cl^–, Ar, K⁺

• O^2–, S^2–, Se^2–

• Ca²⁺, Fe²⁺, Zn²⁺

1. Which of the following elements has the highest ionization energy?

• 1. Carbon

• Sodium

• Aluminum

• Neon

• Potassium

1. Order the following species from smallest to largest radius: Ca, Ar, Al

• 1. Ar < Ca < Al

• Al < Ca < Ar

• Al < Ar < Ca

• Ar < Al < Ca

The form of electromagnetic radiation that has more energy per photon than ultraviolet rays (λ = 10^-8 m) but less energy per photon than gamma rays (λ = 10^-12 m) is

• Microwave (10^-2 m)

• Radio waves (100 m)

• X rays (10^-10 m)

• Infrared rays (10^-6 m)

• 1. None of these

How many valence electrons does a neutral Arsenic atom have?

• 2

• 3

• 5

• 15

1. When a phosphorus atom is converted to a phosphide ion, what happens to the number of unpaired electrons and the total number of electrons around the phosphorus atom?

• Unpaired - increases; Total - increases

• Unpaired - decreases; Total - increases

• Unpaired - increases; Total - remains the same

• Unpaired - decreases; Total - remains the same

• Unpaired - decreases; Total - decreases

Arrange the following in order of increasing ionization energy: As, Sr, F

• F < As < Sr

• F < Sr < As

• Sr < As < F

• Sr < F < As

Gaseous atoms of which of these elements contain one or more unpaired electrons?

Ge (32) As (33) Se (34)

• As only

• Ge and As only

• Ge and Se only

• Ge, As, and Se

• Se only

What is the energy of a photon of light with a wavelength of 6.25 x 10^-7 m?

• 3.18 x 10^-19 J

• 1. 5.21 x 10^-19 J

• 6.42 x 10^-17 J

• 1.06 x 10^-27 J