Transcript Parts of the Atom - Issaquah Connect

Parts of the Atom
Notes
Parts of the Atom:
2 parts:
Nucleus and electron cloud
________
Contains:
Contains:
Protons and __________
Neutrons
__________
1 amu
with relative mass _________
1 amu
_________
and relative charge
+
_________
NONE!!!
_________
“amu” stands for
atomic
_________
mass
_________
Electrons
______________
0______________
(too small to have mass)
_
______________
unit
_______
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
3.
4.
Chemical reactivity is determined by the
electrons
___________________
Atoms are neutral when ___________________
protons = electrons
What happens when atoms gain or lose electrons?
They become (+ ) or (-) charged.
Called:
Called:
Atomic #
____________
__________
Called:
Atomic mass
__________
To calculate # of neutrons:
atomic mass – atomic #
_______________________________
Atomic number = # of protons
# of protons determines which
________________
element it is!!
Who is element # 15?
P
(Phosphorous)
How many protons does lithium have?
3 protons
What is the atomic number of tin?
50
Symbol for Generic “X” Element:
Mass #, A
______________
Atomic #, Z
______________
X
P+N
( # ____________
)
P
( # ____________
)
Periodic Table:
24.305
24
12
Mg
Magnesium
Mg
12