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UNIT 3 Test
Key Ideas (≈ 65% of the Test)
•An atom is the smallest particle that an element can be divided into and remain an element.
•Positively charged protons and neutral neutrons make up an atom’s nucleus
•Electrons are located outside of the nucleus and are negatively charged
•The modern model of the atom is that electron clouds surround a small dense nucleus
•The atomic number defines the element and is the number of protons
•Isotopes are variations of atoms of the same element that have different numbers of neutrons
•Ions are atoms or groups of atoms that have lost or gained a number of electrons
•On the periodic table, periodic refers to the repeating properties of the elements.
•On the periodic table, elements are put in order by their atomic number
•On the periodic table, a vertical column is a family
•On the periodic table, a horizontal row is a period
•On the periodic table, metals on left , non-metals on the right ("staircase" divides)
•How new elements are discovered
Key Skills (≈ 25% of the Test)
•Determine the number of protons, neutrons and electrons in an atom given the name. For
Example:
Given -1 carbon-14, and carbon is atomic number 6
Determine:
Number of protons? Number of neutrons?
Number of electrons?
•Identify a diagram of an atom given the name as in the previous example:
Given -1 carbon-14, and carbon is atomic number 6
Draw a model with correct numbers of protons, neutrons and
electrons.
Elements (≈10% of Test points.)
Ag
silver
Al
aluminum
Ar
argon
Au
gold
B
boron
Ba
barium
Be
beryllium
Bi
bismuth
Br
bromine
C
carbon
Ca
calcium
Cl
chlorine
Co
cobalt
Cr
chromium
Cu
F
Fe
H
He
Hg
I
K
Li
Mg
Mn
N
Na
Ne
copper
fluorine
iron
hydrogen
helium
mercury
iodine
potassium
lithium
magnesium
manganese
nitrogen
sodium
neon
Ni
O
P
Pb
Pt
S
Si
Sn
Sr
U
W
Zn
nickel
oxygen
phosphorus
lead
platinum
sulfur
silicon
tin
strontium
uranium
tungsten
zinc