2.1 Review

Question 1

What are valence electrons?

Answer 1

Electrons on the very outer shell.

Question 2

What type of bonds do valence electrons participate in?

Answer 2

Chemical bonds

Question 3

Which element only has 2 valence electrons and is considered stable?

Answer 3

Helium

Question 4

What is an isotope?

Answer 4

Same element but has a different number of neutrons.

Question 5

What do neutrons change for an element?

Answer 5

The mass number

Question 6

Where are protons and neutrons located?

Answer 6

The nucleus

Question 7

What job do neutrons do for the nucleus?

Answer 7

Stabilize

Question 8

True or False
Will the atoms of Carbon-12 react the same as Carbon-14 in a chemical reaction?

Answer 8

True

Question 9

How are isotopes helpful?

Answer 9

Can be tracers

Question 10

What do chemical reactions deal with?

Answer 10

Atoms and electrons

Question 11

An atom has 8 protons, 8 neutrons, and 10 electrons.
What is the element?
Mass number?
Net charge?

Answer 11

Oxygen
16
-2

Question 12

An atom of Chlorine has a mass of 35 and a net charge of -1. How many of each particle does it contain?

Answer 12

Protons- 17
Neutrons- 18
Electrons- 18