Download Atomic Structure Worksheet

Mirhashemi/Chemistry
Name ________________________________
Period ___ Date ___/___/___
Ch4 • Atomic Structure
4.1-ATOMIC STRUCTURE
Parts of Atoms:
Most people already know that the atom is made up of
three main parts, the _______________ and
______________ in the nucleus and the
______________ somewhere outside of the
nucleus.
How Many Particles in Each Atom?
The particle that defines the identity of an atom is the
_____________. (shown on the periodic table)
Every hydrogen atom has ___ proton.
Every magnesium atom has ___ protons.
Any atom that has 23 protons is _________________.
Any atom that has 92 protons is _________________.
Let’s summarize:
proton
neutron
electron
The mass of an atom is mostly from the ___________
and ____________.
Find O on the periodic table. It’s mass is ______ amu.
It has ___ protons. It must have ___ neutrons.
symbol
charge
location
mass
size (see below)
Let’s make this more visual using information from
the Chart of Fundamental Particles.
If the proton were 10 cm in diameter… the size of an
orange, how big would everything be?
Electrically neutral atoms (as opposed to ions) have
one electron for every proton.
Fill in this chart for these neutral atoms:
Atom
Mass
protons
neutrons
electrons
He
object
proton
neutron
electron
atom
actual size
10-15 m
10-15 m
10-18 m
10-10 m
model size
10 cm
model
orange
Si
Be
H
Rn
The atom is often represented as a miniature
___________ _____________. Draw it:
Ar
F
Pb
The mass of the atom is due to the
_____________________________
The size of the atom is due to the
__________________
If the mass is not close to a whole number, it is
because the atom has several _____________.
These are atoms with the same number of
___________ but different numbers of
_____________.
Chlorine has two isotopes: Cl-35 ( ___ p+ & ___ n)
and Cl-37 ( ___ p+ & ___ n).
Mirhashemi/Chemistry
Ch4. Atomic Structure
Isotopes
21.
Give the mass number of each of the
following atoms:
(a) an iron atom with 30 neutrons
(b) an americium atom with 148 neutrons
(c) a tungsten atom with 110 neutrons
23.
Give the complete symbol ( AZ X ) for each
of the following atoms:
(a) nitrogen with 8 neutrons
(b) zinc with 34 neutrons
(c) xenon with 75 neutrons
25.
How many electrons, protons, and neutrons
are there in an atom of:
(a) carbon-13, 13 C
(b) copper-63, 63 Cu
(c) bismuth-205, 205 Bi
27.
Fill in the blanks in the table (one column
per element).
65
86
Symbol
Cu
Kr
Number of
protons
Number of
neutrons
Number of
electrons
in the neutral
atom
Name of
element
78
117
46
36
29.
Radioactive americium-241 is used in
household smoke detectors and in bone
mineral analysis. Give the number of
electrons, protons, and neutrons in an atom
of americium-241.
31.
Which of the following are isotopes of
element X, with atomic number of 9:
19
20
9
21
9 X , 9 X , 18 X , and 9 X .
33.
Name
Verify
___________________________________
that the atomic mass of magnesium
Period
is 24.31
___ Date
amu,___/___/___
given the following
information:
24
Mg , mass = 23.985042 amu; percent
abundance = 78.99%
25
Mg , mass = 24.985837 amu; percent
abundance = 10.00%
26
Mg , mass = 25.982593 amu; percent
abundance = 11.01%