7.6: Periodic Trends and Chemical Properties

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Trends

Exercise \(\PageIndex{1}\)

Which of the following elements would be expected to have chemical and physical properties most similar to Iodine (I)?

Fluorine (F)
Aluminum (Al)
Magnesium (Mg)
Rubidium (Rb)
Krypton (Kr)

Answer: a. Fluorine (F)

Exercise \(\PageIndex{2}\)

What is the charge formed by alkaline earth metals when they react with nonmetals?

a. +1 b. −1 c. +2 d. −2 e. +3

Answer: c. +2

Exercise \(\PageIndex{3}\)

A metal oxide forms when potassium reacts with oxygen. What is the most likely formula of this metal oxide?

a. KO b. K₂O c. K₂O₃d. KO₂e. KO₃

Answer: a. KO

Exercise \(\PageIndex{4}\)

A metal phosphide forms when potassium reacts with elemental phosphorus. What is the most likely formula of this metal phosphide?

a. KP b. K₃P c. K₂P₃d. K₃P₂e. KP₃

Answer: b. K₃P

Exercise \(\PageIndex{5}\)

A metal halide forms when potassium reacts with elemental chlorine. What is the most likely formula of this metal halide?

a. KCl b. KCl₂c. K₂Cl d. KCl₃e. K₃Cl₂

Answer: b. KCl₂