1. Atom Notes Adapted from Harris Middle School: NEISD
Name: _____________________________________
_______________: chart where all elements are arranged by ________________and ____________-this is your cheat sheet to make models of atoms!!
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.
_______________= # 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_________________)
Name of subatomic particle
Charge of Particle
Where it is found
Size/mass
proton
inside the nucleus- identifies the atom
Negative (-)
in electron cloud / orbiting around nucleus- determines reactivity of element
Almost zero
1/1836 amu
(very small!)
neutron
Neutral (0)
1 atomic mass unit
Label the subatomic particles in the picture:
p+ = proton
n0 = neutron
e- = electron
Color the neutrons red
Color the electrons green