Question

bonding - naming ionic compounds
name: kimora bright period: 4th

1. how does an atom of aluminum become an ion?

a. it gains 3 electrons
b. it gains 3 protons
c. it loses 3 electrons
d. it loses 3 neutrons

1. how many electrons are shared within a single bond?

a. 0
b. 1
c. 2
d. 4

1. the chemical bond formed when two atoms share electrons is called a(n)

a. covalent bond
b. ionic bond
c. metallic bond
d. electron bond

1. which pair of atoms will combine with each other and form an ionic bond?

a. c and o
b. c and h
c. ca and mg
d. ca and br

1. which element is most likely to gain electrons in a chemical reaction?

a. kr
b. k
c. br
d. ca

1. what is the oxidation number of oxygen in most compounds?

a. 6
b. -2
c. 8
d. 0

1. which formula represents a substance that contains covalent bonds?

a. licl
b. cacl2
c. k2o
d. co2

1. which of the following is the reason why atoms of sodium and chlorine attract each other in a salt crystal?

a. sodium has a positive charge and chlorine has a negative charge
b. sodium has a negative charge and chlorine has a positive charge
c. both have a positive charge
d. both have a negative charge

1. cations are ions with a positive / negative charge that are formed when an atom gains / loses electrons.
2. anions are ions with a positive / negative charge that are formed when an atom gains / loses electrons.

Explanation:

1. Aluminum has 3 valence electrons and loses them to achieve a stable - electron configuration, becoming a cation.
2. In a single bond, 2 electrons are shared.
3. A covalent bond is formed when atoms share electrons.
4. Ionic bonds form between a metal and a non - metal. Calcium (Ca) is a metal and bromine (Br) is a non - metal.
5. Non - metals tend to gain electrons. Bromine (Br) is a non - metal among the options.
6. Oxygen usually has an oxidation number of - 2 in most compounds.
7. Covalent bonds are present in non - metal compounds. CO₂ is a non - metal compound.
8. In sodium chloride, sodium forms a positive ion and chlorine forms a negative ion, and opposite charges attract.
9. Cations are positively charged ions formed when an atom loses electrons.
10. Anions are negatively charged ions formed when an atom gains electrons.

Answer:

1. C. It loses 3 electrons
2. C. 2
3. A. Covalent bond
4. D. Ca and Br
5. C. Br
6. B. - 2
7. D. CO₂
8. A. Sodium has a positive charge and chlorine has a negative charge
9. positive; loses
10. negative; gains