Module 3

Isotopes/mass #

100

Oxygen-17

Protons: 8

Neutrons: 9

200

How many neutrons in helium-4

2

300

Carbon-14

Proton: 6

Neutron: 8

400

Hydrogen-1

proton:1

Neutron:0

500

How many neutrons in Magnesium-24

12

Definitions

100

Building block of matter

atom

200

smaller particles that make up an atom

subatomic particles

300

 Matter cannot be created or destroyed but can change forms.

Law of conservation

400

A region of space around the nucleus where electrons are most likely to be found

Orbitals

500

 Atoms of an element with the same number of protons but different numbers of neutrons

Isotopes

Valence electrons

100

Oxygen 

6

200

Sodium

1

300

neon

8

400

Aluminum 

3

500

Nitrogen

5

Periodic table

100

Have the same number of valence electrons

groups

200

the number of occupied energy levels

Periods

300

The most reactive group

Alkali Metals

400

How does the reactivity of the alkali metals change as you go down the group from top to bottom?

increases

500

What is the least reactive group?

Noble Gases

Structure of an atom

100

The number of protons

Atomic number

200

Protons+neutrons

Atomic mass

300

Suggested there must be tiny but concentrated positively charged mass in the center of the atom

Rutherford

400

model illustrates negatively charged particles spread evenly throughout a positively charged mass of matter

Plum Pudding Model

500

How do electrons move between orbitals?

gaining or losing energy