Chemistry
Posttest
Science
8 2014
what is the
current model
of the atom
electron
cloud
model
which parts are
in the nucleus,
and what are
their charges
proton (+) and
neutron
(neutral-no
charge)
which part is in
the cloud and
what is its
charge
electrons
(negative)
what
determines the
atomic number
of an element
the number
of protons
what are
isotopes
atoms of the same
element that have
different numbers
of neutrons
what makes
an element
radioactive
isotopes that have too
many neutrons, will try
to become stable, in
the process giving off
radiation
why are
radioactive
elements
dangerous to living
organisms
they can poison a
food chain with
radioactivity, it
can cause cancer
How is 1/2 life
decay
information used
by scientists?
to date items,
carbon dating
Who developed
the first periodic
table
Mendeleev
How was the
arrangement of the
first periodic table
different from the
one used today
Moseley improved
it by arranging
elements by
increasing
ATOMIC NUMBER
explain what a
period is on the
periodic table
horizontal row,
left to right, (like a
sentence) ends in
a PERIOD
what is a group
or family on the
periodic table
vertical
column, top
to bottom
where are the
metals located
on the periodic
table
left hand
side, left of
the step
where are the
nonmetals on
the periodic
table
on the right
hand side
where are the
metalloids on
the periodic
table
along the step
(starts at B,
ends at Te)
Give family/group
for Alkali Metals
and list a member
1 lithium,
sodium,
potassium
Give family/group
for Alkali Earth
Metals and list a
member
2 beryllium,
magnesium,
calcium
Give family/group
for Nobel Gases
and list a member
18 helium,
neon,
argon
Give family/group
for Halogen
Group and list a
member
17 fluorine,
chlorine,
bromine
Give family/group
for Carbon Family
and list a member
14 silicon,
germanium,
tin
Give family/group
for Oxygen
Family and list a
member
16 sulfur,
selenium,
tellurium
Give family/group
for Boron Group
and list a member
13 aluminum,
gallium,
indium
Give family/group
for Nitrogen
Family and list a
member
15 phosphorus,
arsenic,
antimony
How is
atomic mass
determined
the average of all
the isotopes of an
element (in
proportion to their
natural abundances)
Using an
element key,
where is the
atomic mass
the usually
decimal
number under
the symbol
Using an
element key,
where is the
atomic number
the whole
number, above
the symbol
Using an
element key,
where is the
symbol
one or two letters
that represent the
name of the
element
using an
element key,
what is the
state of matter
look for balloon
(gas), drop
(liquid), or cube
(solid)
using an element
key, what are the
number of
protons
whole number
above the
symbol= atomic
number= protons
using an
element key,
how many
neutrons
round atomic mass
(decimal) and then
subtract the atomic
number (whole
number)
using an
element key,
how many
electrons
look at whole
number above
symbol=electrons
using an element
key, what is the
name of an
element
look for the
whole word
usually at top of
element key
If copper has an
atomic number
of 29, how many
electrons
29 (atomic
number=protons=electrons)
plutonium has an
atomic number of 78
and an atomic mass
of 195.078, how
many neutrons
195
(rounded) 78= 117
Strontium has an
atomic number of 38,
and an atomic mass
of 87.62, does it have
isotopes? why?
yes 137.327 is a
DECIMAL number
which means it is an
average of all naturally
found ISOTOPES
If Potassium has
19 electrons and
an atomic mass of
39.098, how many
protons?
19
protons=electrons