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Atomic Theory
Matter
Measurement
How many significant figures
does the following number
have? 40.008
5
How many significant figures
does the following number
have? 0.005460
4
How many significant figures
does the following number
have? 10000
1
How many significant figures
does the following number
have? 10000.
5
The density of an object is 12
g/ml and it has a mass of 4
grams. What is its volume?
0.33 mL
Name the three fundamental
subatomic particles of the atom.
neutron, proton, electron
The smallest particle of an
element that has the properties
of that element
atom
Is orange juice a homogeneous
or heterogeneous mixture?
heterogeneous
The number of protons in an
element is known as its
______.
atomic number
The mass number is defined
as the number of …….
protons plus neutrons
An element has an atomic
number of 51. How many
protons and electrons must
this atom have if it is neutral?
51 protons, 51 electrons
A cup is supposed to weigh 500.0 g.
You weigh it 5 times and get the
following gram measurements.
432.2, 433.1, 432.6, 433.0, 432.9.
What can be said about this data in
terms of precision and accuracy?
The data is precise, but
inaccurate
A cup is supposed to weigh 500.0 g.
You weigh it 5 times and get an
average mass of 433.0 g. What is
the percent error in the mass?
13.4%
Which subatomic particle has
differing amounts in
isotopes?
neutrons
How many protons, electrons,
and neutrons does a neutral
atom with an atomic number
of 85 and a mass number of
210 have?
85 p, 85 e, 125 n
How many protons, electrons,
and neutrons does a -3
charged atom with an atomic
number of 85 and a mass
number of 210 have?
85 p, 88 e, 125 n
Who discovered the electron?
J.J. Thompson
What device did J.J. Thompson use
to discover electron?
Cathode Ray Tube
Which researcher discovered
the proton?
Ernest Rutherford
Can you name three conclusions
from Rutherford’s gold foil
experiment.
- Atom is mostly empty space (the nucleus is
small compared to entire size of atom)
- Most of the mass of the atom is in the center
- The positive charged particle (proton) must
be in the center of the atom
Who is considered the father of
modern chemistry?
Robert Boyle
Element X contains three naturally
occurring isotopes with masses of
78.0, 79.0, and 80.0 amu. What data
is needed to calculate its average
atomic mass?
The natural abundance in percent of each
isotope (Can you do these calculations?)
What was John Dalton’s main
contribution to the theory of
the atom?
Elements are made of very
small particles called atoms
T or F. An electron has very
little mass when compared to
a proton.
True
Which element is shown
below.
93
41
Nb
X
T or F. A neutron and proton
have roughly the same mass
and charge.
False, almost same mass
but different charge
T or F. A neutron and electron
have different masses but the
same charge.
False, different masses
but different charge
What are the names of the
quarks?
Up, down, strange, charm,
beauty (bottom), truth (top)
Which type of cell has a
nucleus? A prokaryote or an
eukaryote? (Can you
remember your biology
eukaryote
You should understand the atomic
theory timeline and the various
models of the atom as they
developed!!!
You should be able to calculate
average atomic masses.