Which of the following has an element with a stable electron configuration?

• lithium

• barium

• boron

• helium

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Typically, atoms gain or lose electrons to achieve

• an exchange of energy.

• ionization.

• a stable electron confiuation.

• vaporization.

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An an element is most stable when

• it only has to lose one electron to achieve stable configuration.

• it can only form four bonds.

• it has to gain only one electron to achieve stable configuration.

• its highest occupied energy level is filled.

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NGSS.HS-PS1-1

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Ionization energies tend to

• decrease from left to right acroos a period

• increase from the top of a group to the bottom

• increase from left to right across a period

• decrease from the bottom of a group to the top

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NGSS.HS-PS1-1

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The formation of an ionic bond involves the

• transfer of electrons

• transfer of neutrons

• transfer of protons

• sharing of electrons

Which of the following statements correctly describes the substance with the formula KI?

• There is a one-to-one ratio of potassium ions to iodide ions.

• Potassium iodide is a molecular compound.

• Potassium iodide is a polyatomic ion.

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NGSS.HS-PS1-3

In the compound MgCl₂, the subscript 2 indicates that

• there are two magnesium ions for each ion of chlorine

• the chloride ion is twice the size of the magnesium ion.

• magnesium and chlorine form a double covalent bond.

• there are two chloride ions for each magnesium ion.

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NGSS.MS-PS1-1

When two atoms of the same nonmetal react, they often form a(an)

• ionic bond

• polyatomic ion

• diatomic molecule

• polar molecule

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NGSS.HS-PS1-2

You see a structural formula in which the symbols for elements are connected by a long dash. You can assume that the chemical bonds in the compound are

• ionic

• covalent

• metallic

• unstable

Which of the follwoing formulas represents a compound whose molecules contain a triple bond?

• O=O=O

• O₃

• SO₃

• N≡N