Of the more than one hundred elements that occur in nature or that have been produced synthetically, only the _____________________ exist naturally as single, uncombined atoms.

• noble gases

• halogens

• alkaline metals

• rare earth metals

• transition metals

The reason the atoms form chemical bonds is that bonded atoms

• tend to have lower energy than single, uncombined atoms

• tend to have higher energy than single, uncombined atoms

• need to obtain an octect valence shell of electrons

• need to lose or gain electrons

• tend to have stable ions

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Chemical bonding involves the interaction of

• valance electrons

• core electrons

• valance and sometimes core electrons

• protons

• none of the above

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The dots around the Lewis dot diagram like the one below indicates/illustrates

• valance electrons

• core electrons

• valance and sometimes core electrons

• protons

• none of the above

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Because of the large differences in electronegativity, the atoms in an ionic compound usually come from the

• s block metals and the p block non-metals.

• p block metals and the s block non-metals.

• s block metals and the d block metals.

• s block transition metals and the p block non-metals.

• s block metals and the p block transition metals

To which main group on the periodic table does X belong?

MgX

• 16

• 2

• 15

• 17

• 1

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NGSS.HS-PS1-1

To which main group on the periodic table does X belong?

X₂SO₄

• 16

• 2

• 15

• 17

• 1

To which main group on the periodic table does X belong?

X₂O₃

• 16

• 2

• 15

• 3

• 1

A solid compound consists of ions bound in a crystal lattice. Which property would you not expect this solid to have?

• high melting point

• good conductivity of heat or electricity in the solid state

• hard

• soluble in a polar solvent

• brittle

Which of the following statements about "ionic bonding" is INCORRECT.

• The force of attraction between oppositely charged ions (cations and anions) constitutes an ionic bond.

• Ionic bonding occurs between atoms of elements that have large differences in electronegativity.

• The units of ionic compounds can be separated easily by direct heating of the crystal salt.

• The ions that make up the ionic solid are arranged in a specific array of repeating units.

• The ions that make up the ionic solid are arranged in a rigid lattice structure so that the cations and anions are arranged so that the system has the minimum possible energy.