6. Ionic bonds are formed when: a) Electrons are shared b) Electrons are transferred c) Atomic orbitals overlap d) Valence electrons are delocalized 7. Which pair is most likely to form an ionic bond? a) C and O c) Na and F b) H and Cl d) Cl and Br 8. Which compound is not an ionic compound? a) NaCl b) MgO c) CO_(2) d) KBr 9. The charge of the calcium ion in CaCl_(2) is: a) +1 b) -1 c) +2 d) -2

6. Ionic bonds are formed when:
b) Electrons are transferred

Ionic bonds are formed when one atom donates electrons to another atom, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions). The electrostatic attraction between these oppositely charged ions holds them together in an ionic compound.

7. Which pair is most likely to form an ionic bond?
c) Na and F

Sodium (Na) is a metal that tends to lose electrons and form a positive ion, while fluorine (F) is a nonmetal that tends to gain electrons and form a negative ion. The transfer of electrons from sodium to fluorine results in the formation of an ionic bond, creating the ionic compound sodium fluoride (NaF).

8. Which compound is not an ionic compound?
c) $$CO_{2}$$

Carbon dioxide ( $$CO_{2}$$ ) is a covalent compound, not an ionic compound. In covalent compounds, atoms share electrons rather than transferring them. The atoms in $$CO_{2}$$ share electrons to form covalent bonds, resulting in a molecule with a neutral charge.

9. The charge of the calcium ion in $$CaCl_{2}$$ is:
c) $$+2$$

In the compound calcium chloride ( $$CaCl_{2}$$ ), the calcium ion (Ca) has a charge of +2. This is because calcium is an alkaline earth metal that tends to lose two electrons to form a positive ion with a charge of +2. The two chlorine atoms (Cl) each have a charge of -1, and the overall charge of the compound is neutral.