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