Atomic Theory CP History of the Atom; Modern Atomic Theory, Subatomic Particles.
The Atomic Theory
-
Upload
yssa-villanda -
Category
Education
-
view
147 -
download
0
Transcript of The Atomic Theory
What is the net charge of this nucleus?
4
5
1
2
3
31
2
6
6 protons = +63 neutrons = 0but no
charge
= +6
Make sure you read the question well.
1. What is the net charge of the atom?that would be 0
2. What is the net charge of the nucleus?that’sgonna be be+6
ATOMIC NUMBER-the number of protons in the nucleus
LOOKING AT THISATOM HERE:
What is the atomicnumber ?
6
MASS NUMBER-the number of protons plus the number of neutrons
LOOKING AT IT
6
atomicmass
Protons Neutrons
3+ = 9
8 – 6 = 2 neutrons
CC – 8
X
6
12 . 0
6
14
atomicnumber
massnumber
atomicnumber
massnumber
this is NOT themass number
C – 8 C – 12 C – 18
C – 20 C – 22 C – 24
Different forms of CARBON
ISOTOPES
same # of PROTONS but different # of NEUTRONS
same ATOMIC # but different MASS #
C – 8 C – 12 C – 18
C – 20 C – 22 C – 24
Different weights of CARBON
11 . 8 g 12 g 11 . 6 g
12 . 4 g 12 . 2 g 12 g
What is the AVERAGE WEIGHT of all these ISOTOPES of Carbon?
12 AND THISIS WHAT…
C6
12 . 0
…THIS NUMBERREPRESENTS
the ATOMIC WEIGHT- average weight of all the ISOTOPES for a given element
IT MAKES SENSE
ATOMIC WEIGHT MASS NUMBER- has DECIMAL POINTbecause it representsan AVERAGE number
- has no DECIMAL POINT.either there are protons or neutrons or none,there's NO AVERAGEbeing taken.