Download Atom notes worksheet

Atom Notes
Name: _____________________________________
Adapted from Harris Middle School: NEISD
An __________________ is the basic unit of all matter. It is
the smallest particle into which an __________
cannot be broken down into a simpler substance.
There are 2 main locations in an atom:
• ______________(the center with most of the mass of the
atom)
• _____________ (surrounds the nucleus)
There are 3 subatomic particles in an atom:
• subatomic means smaller (than the atom itself)
• 3 particles = ___________, ___________, and_________
• the numbers of these particles make atoms __________
from one another.
Name of
subatomic
particle
Charge of
Particle
Size/mass
inside the
nucleusidentifies the
atom
proton
Negative (-)
neutron
Where it is
found
Neutral (0)
in electron
cloud /
orbiting
around
nucleusdetermines
reactivity of
element
Almost zero
1/1836 amu
(very small!)
_______________:
chart where all
elements are
arranged by
________________
and ____________this is your cheat
sheet to make
models of atoms!!
_______________= # of protons = element’s identity
_______________= # of protons in an atom (neutral)
______________is 1 or 2 letters- First letter is always
capitalized; if it has 2 letters the second is lower case
_______________= # of protons + # of neutrons
_______________= atomic mass – atomic #
atoms of an element can have different numbers of
neutrons (these atoms are_________________)
Label the subatomic particles in the picture:
p+ = proton
n0 = neutron
e- = electron
1 atomic
mass unit
Color the neutrons red
Color the electrons green