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Activity 6.4
Homework: “Review chemical bonds and Lewis structures”

Name_Joshua Valadez Ramirez__ID_1223428__Group_____

1. Complete the table below with your knowledge on atoms. Thefirst one is done already as an example.

element | chemical symbol | # electrons | valence shell | # valence electrons | # electrons gained or lost | ion notation |
Bromine | Br | 35 | 4 | 7 |1 gained | Br- |
Lithium | Li | 3 | 2 | 1 | 1 lost | Li |
Calcium | Ca | 20 | 4 | 2 | 2 lost | Ca |
Sulfur | S | 16 | 3 | 6 | 2 gained | S |
Boron | B | 5 | 2 | 3 | 3 lost | B |
Silicon |Si | 14 | 3 | 4 | 4 gained or lost | Si |
Phosphorus | P | 15 | 3 | 5 | 3 gained | P |

2. Indicate the types of bonds (intramolecular and intermolecular when possible) in each of thefollowing compounds.

Compounds or Elements | Type of bonds (intra- and intermolecular) | Compounds or Elements | Type of bonds (intra- and intermolecular) |
N2 | Non polar covalent | Cu-Cu | Nonpolar covalent |
Na2O | Ionic | NH3 | Polar covalent |
MgCl2 | Ionic | CaO | Non polar covalent |
HBr | Polar covalent | Ag-Ag | Non plar covalent |
CCl4 | Polar covalent | CH4 | Polarcovalent |
H2O | Polar covalent | KF | Ionic |

3. Ionic compounds. Draw the Lewis structures for the following ionic compounds. Make sure to use different colours or dots/crosses for the differentelements involved. Indicate the transfer of electrons with arrows. Write the correct chemical formula below each drawing.

a) potassium + iodine b) magnesium + oxygen c) lithium +nitrogen

Mg-O

K-ILi
I...