Chapter 4 in Class

Question 1

What are the 7 diatomic molecules?

Answer 1

Iodine, Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine

Question 2

Why do the electronegativity values increase from the left to the right of the periodic table?

Answer 2

Because there is an increase in positive charge of the nucleus in this direction.

Question 3

Why does electronegativity increase from the bottom of the periodic table to the top?

Answer 3

Because the size of the atom decreases resulting in a smaller distance between the nucleus and valence electron shell increases attraction between protons and electrons.

Question 4

When do dipole moments exist?

Answer 4

When a bond is formed between 2 atoms with different electronegativities. (The more electronegative atom indicates that electron density is located at the more electronegative atom.

Question 5

How to tell if a molecule is polar or not?

Answer 5

It is polar if it has either of the following.
If the central atom has lone pair(s) of electrons
There are at least 3 different types of atoms in the molecule