Chemical Bond (16-20)

Typically, atoms gain or lose electrons to achieve

• an exchange of energy.

• ionization.

• a stable electron configuration.

• vaporization.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

In an electron dot diagram, the symbol for an element is used to represent

• the nucleus

• the nucleus and all electrons

• the nucleus and valence electrons

• the nucleus and all nonvalence electrons

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NGSS.HS-PS1-1

Study the electron dot diagrams for lithium, carbon, fluorine, and neon in Figure 6-1. Choose the statement that correctly identifies the most stable of the elements.

• Lithium is the most stable element because it has to lose only one electron to achieve a stable configuration.

• Carbon is the most stable element because it can form four bonds.

• Fluorine is the most stable element because it has to gain only one electron to achieve a stable configuration.

• Neon is the most stable element because its highest occupied energy level is filled.

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NGSS.HS-PS1-1

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

Which of the following is a typical property of an ionic compound?

• low melting point

• poor conductor of electric current when melted

• tendency to shatter when struck

• all of these

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NGSS.HS-PS1-3