Ion Formation and Chemical Bonds

Valence electrons are those that are

• closest to the nucleus.

• freely floating between atoms.

• in the outermost energy level of the atom.

• unable to become involved in chemical bonding.

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Oxygen has six valence electrons. When forming an ion, oxygen will

• lose six electrons and have a charge of +6.

• lose six electrons and have a charge of -6.

• gain two electrons and have a charge is +2.

• gain two electrons and have a charge of -2.

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Atoms and ions that are isoelectronic have

• the same charge.

• the same number of electrons.

• the same number of protons.

• no charge since the number of protons and electrons is equal.

Look at the periodic table. What should be the charge on the ion formed by calcium?

• +1

• +2

• -1

• -2

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Atoms that have gained electrons form

• cations.

• anions.

• negions.

• positrons.

Most elements are most stable when their outermost energy levels contain ________ electrons.

• 2

• 6

• 8

• 18

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Which of the following pairs of atoms and/or ions is isoelectronic?

• Na and K

• Cl and Cl^-1

• Ne and Na⁺¹

• O^-2 and S^-2

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Which of the following tend to gain electrons when forming ions?

• metalloids

• metals

• nonmetals

• cations

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Which of the following groups on the Periodic Table will only form ions with positive charges?

• Group 2

• Group 15

• Group 17

• Group 18

What charge will a Beryllium ion have?

• +
• 2+
• 2-
• -

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