Identify and describe the particles that make an atom.

What are the 3 particles inside an atom & what charge does each have?

Protons: small particles in the nucleus of an atom. They have a positive charge.

Neutrons: small particles in the nucleus of an atom. They have no charge.

Electrons: tiny particles of an atom that move around the nucleus. They have a negative charge.

+

-

N

Atoms

ALSO: Complete BrainPop Activity worksheet

HHydrogen

1.008 atu

1

Name: Date: Class#:

1H

Hydrogen1.008 atu

1This is called th

e atomic

number. It is

always equal

to the number o

f protons.

Also, electro

ns =

protons.

(Write

this

in your vocabulary!)

The mass is m

easured

in atomic units = atu

This is called the atomic mass and is equal to protons + neutrons. (more vocabulary!)

We round this number off to the nearest whole number, so for Hydrogen the mass is 1 atu

Atomic Mass - Protons= # of Neutrons (add to 3rd box)

Name:

Date: Period#:

1H

Hydrogen

1.008 atu

1atomic number

= protons

= electrons

atomic units = atuatomic mass = protons + neutrons

Round this number off to the nearest whole number

Ex: 1.008 1.0

Name:

Date: Period#:

Atomic mass – Atomic # = # of Neutrons

Make your Notes pg. match this slide!

Element Symbol

Element Name

“Nucleus #”

1H

Hydrogen

1 atu

1

Lets draw a hydrogen atom…= protons

= electrons

= protons + neutrons

+

HYDROGEN

+

Electron (-)

Proton (+)

2He

Helium

4.003atu

Draw a Helium atom

= protons

= electrons

Round off to 4 – 2 = 2 neutrons

HELIUM

+

+proton

neutron

electron(Negative)

(positive)

(neutral)

Draw a Carbon atom

6C

Carbon

12.011atu

This ring holds up to 2 electrons.

This ring holds up to 8 electrons.

This ring holds up to 8 electrons.

Draw a Carbon atom

6C

Carbon

12.011atu

CARBON

+ ++

++

+N

NN

N NN

CARBON

+ ++

+++ N

NN

N NN

Use the following information to draw a sodium atom…

NaSodium

22.9 atu

11= 11 protons

= 11 electrons

= 23 – 11 = 12 neutrons

N+

SODIUM ATOM

+

+ ++

++

+

+

+

+

+

NN

NN

NNN N

N

N

N

N

Al

aluminum

13

26.9 atu

=protons

= electronsRound off and subtract atomic mass from it

27-13 = 14 neutrons

Use the following information to draw a aluminum atom…

AlAluminum

26.9 atu

13

+

+ ++

++

+

+

+

+

+

NN

NN

NNN N

N

N

N

NNN

protons = 13

electrons = 13

neutrons = 14

Holds up to 8

Holds up to 8

Holds up to 2

The Musical Table Of Elements

http://www.privatehand.com/flash/elements.html

http://www.youtube.com/watch?v=zUDDiWtFtEM&safe=active