Physical Science Unit 8 - Elements and Bonds (Practice)

If the elements in a molecule are not sharing electrons equally, the molecule will be asymmetrical or ________.

• nonpolar

• polar

• ionic

• metallic

Which elements generally form an ionic bond?

• metal and nonmetal

• 2 or more nonmetals

• metal and metal

• none of the above

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Which elements generally form a covalent bond?

• metal and nonmetal

• 2 or more nonmetals

• metal and metal

• none of the above

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In chemical compounds, covalent bonds are formed when

• the electronegativity difference between two atoms is very large

• valence electrons are transferred between a metal and a nonmetal

• pairs of electrons are shared between two nonmetal atoms

• a sea of mobile electrons surrounds the cations

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An ionic bond forms when:

• Pairs of electrons are shared between two nonmetal atoms.

• A sea of mobile electrons surrounds the cations.

• Valence electrons are transferred between a metal and a nonmetal.

• The electronegativity difference between two atoms is very large.

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What is a valence electron?

• an electron that is found in the outermost shell of an atom. 
• an electron found in the innermost shell of an atom.
• an electron found in the middle shell.

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Which of the following is an ionic compound?

• CH₄

• I₂

• LiBr

• CO

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Which of the following is a covalent compound?

• CaO

• NaCl

• BaCl₂

• CO₂

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Predict the type of bond that will form between Be and F.

• Ionic

• Covalent

• Metallic

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Name the following covalent molecule: N₂O

• nitrogen oxide

• nitrogen (II) oxide

• dinitrogen monoxygen

• dinitrogen monoxide