Parts of the Atom

1
Parts of the Atom

• Notes

2
Parts of the Atom 2 parts ________ and
electron cloud
Nucleus
Contains
Contains
__________ and __________
______________ with relative mass _________
_________ ______________ and
relative charge _________ _________
______________ amu stands for
_________ _________ _______
Protons
Neutrons
Electrons
1 amu
1 amu
0 (too small to count mass)
_

NONE!!!
atomic mass unit
3
Relationships between Particles
1. Atomic number is the of ___________________
protons
2. Mass number is the of ________ ________
protons
neutrons
What is the atomic mass of this atom??
12
4
3. Chemical reactivity is determined by the
___________________
electrons
4. Atoms are neutral when ___________________
protons electrons
5
Called __________
Called ____________
Atomic
Called __________
Atomic mass
To calculate of neutrons ______________________
_________
atomic mass atomic
6
Atomic number of protons of protons
determines ________________ Who is element
15? How many protons does lithium have? What
is the atomic number of tin?
which element it is!!
P (Phosphorous)
3 protons
50
7
Symbol for Generic X Element
______________ _____________
Mass , A
P N
X
( ____________ ) ( ____________ )
Atomic , Z
P
8
Write the symbol for magnesium
Periodic Table
Mg
24
12