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Transcript
Unit 2 (Atoms)
Vocabulary!
Word
Definition
1 matter
Anything that has mass and
takes up space.
2 atom
Tiny building blocks of all
matter.
3 Atomic Theory
An idea about what atoms look
like and how they behave
based on observations &
inferences.
4 proton
Positive charged particle found
in the nucleus of the atom.
5 neutron
Neutral particle found in the
nucleus of the atom.
6 electron
Negative charged particle
found orbiting around the
outside of the nucleus.
7 nucleus
The center of the atom that
contains protons & neutrons.
8 molecule
Two or more atoms joined
together.
9 compound
Two or more DIFFERENT
kinds of atoms joined together.
1
Name__________________________
Period__________ Unit_____________
Synonym (Same) or
Example
Picture or
Sentence
Word
Definition
10 atomic number The number of protons OR
electrons in an atom.
11 atomic mass
The sum of protons AND
neutrons in the nucleus of an
atom.
12 phase change
When matter gains or looses
enough energy to become a
different phase.
13 solid
A phase of matter whose
particles are very tightly
packed together and move by
vibration.
14 liquid
A phase of matter whose
particles are touching but are
free to flow around each other.
15 gas
A phase of matter whose
particles are spread apart,
move around spontaneously
and only touch when they
collide.
16 diffusion
The movement of particles
from an area of high
concentration to an area of low
concentration.
17
18
Synonym (Same) or
Example
Picture or
Sentence