Unit 4: Molecular Compounds Study Guide

Why do some nonmetals, such as helium and neon, stay monoatomic instead of forming compounds? The noble gases stay monoatomic because they already have __________.

• a stable nucleus

• a complete outer orbital

• the same number of protons and electrons

• 6 valence electrons

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NGSS.HS-PS1-1

Molecular compounds are composed of which class of elements?

• metal

• semimetal

• nonmetal

The smallest unit of a molecular compound is called a(n):

• atom

• ion

• molecule

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NGSS.MS-PS1-1

To form a covalent bond, what do the valence electrons have to do?

• get shared

• get transferred

There are three types of covalent bonds depending on the amount of electrons involved in the bond. In a single bond, ________ total electrons are shared, one from each atom in the bond.

• 2

• 3

• 4

• 6

There are three types of covalent bonds depending on the amount of electrons involved in the bond. In a double bond, ________ total electrons are shared, two from each atom in the bond.

• 2

• 3

• 4

• 6

There are three types of covalent bonds depending on the amount of electrons involved in the bond. In a triple bond, ________ total electrons are shared, three from each atom in the bond.

• 2

• 3

• 4

• 6

What are the formulas of the 7 diatomic molecular compounds? (chemical formula is in the format of X₂).

• C₂, He₂, S₂, Se₂, P₂, Ne₂, At₂

• K₂, Ca₂, Na₂, Li₂, Al₂, Zn₂, Cu₂,

• B₂, Si₂, Ge₂, As₂, Sb₂, Te₂, Po₂

• H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

Draw the following three molecules in your notebook using electron dot structures (or look at the handout you did them on) and state how many single, double, and triple bonds it has: N₂

• 1 SB

• 1 DB

• 1 TB

Draw the following three molecules in your notebook using electron dot structures (or look at the handout you did them on) and state how many single, double, and triple bonds it has: H₂O₂

• 2 SB and 1 DB

• 3 SB

• 1 TB

• 1 SB, 2 DB

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NGSS.HS-PS1-1

NGSS.HS-PS1-2