1. Chemical changes A

Question 1

Why are noble gases unreactive?

Answer 1

Atoms of noble gases have complete valence shells. Atoms that have complete valence shells are low in energy and inherently stable.

Question 2

What does it mean when an atom has a complete valence shell?

Answer 2

It is unreactive as it is low in energy and inherently stable.

Question 3

What are the properties of atoms with incomplete valence shells?

Answer 3

They are inherently unstable and very reactive. Hence, they want to react in order to obtain the electronic configuration of noble gases.

Question 4

What is ionic bonding?

Answer 4

Ionic bonding occurs in compounds that are comprised of a metal and non-metal.

Question 5

What is a positively-charged ion?

Answer 5

A cation.

Question 6

What is a negatively-charged ion?

Answer 6

An anion.

Question 7

What happens during ionic bonding?

Answer 7

The metal transfers its valence electrons to the non-metal.

Question 8

What is covalent bonding?

Answer 8

Covalent bonding occurs between the atoms of non-metallic elements.

Question 9

Can atoms be of the same element in covalent bonding?

Answer 9

Yes.

Question 10

What happens during covalent bonding?

Answer 10

The atoms share a pair or more of electrons to obtain the electronic configuration of a noble gas that is closest to them in the periodic table.