1. The 3 particles of the atom are:
Their respective charges are:
a. ___proton__________
a. __positive (+) _______
b. ___neutron___________
b. __neutral_(0)________
c. ___electron____________
c. __negative_(-)_______
2. The number of protons in one atom of an element determines the atom’s
__atomic number________ , and the number of electrons determines
_ net charge_________ of an element.
3. The atomic number tells you the number of _____protons_________ in one atom of an
element. It also tells you the number of ____electrons________ in a neutral atom of that
element. The atomic number gives the “identity “of an element as well as its location on
the Periodic Table. No two different elements will have the _____same_____________
atomic number.
5. The _______mass number_____ of an element is the total number of protons and
neutrons in the_ nucleus_______________ of the atom.
6. The mass number is used to calculate the number of ___neutrons__________ in one
atom of an element. In order to calculate the number of neutrons you must subtract the
__atomic number___________ from the ______mass number_____________ .
7. Give the symbol and number of protons in one atom of:
Lithium
Iron
3Li
92U
Bromine
35Br
Copper
29Cu
80Hg
Oxygen
8O
Mercury
Krypton
36Kr
Helium
2He
8. Give the symbol and number of electrons in a neutral atom of:
Uranium
U
92 electrons
Boron
B 5 electrons
Antimony Sb 51 electrons
Chlorine Cl 17 electrons
Iodine
I
53 electrons
Xenon
Xe 54 electrons
9. Give the symbol and number of neutrons in one atom of:
(To get “mass number”, you must round the “atomic mass” to the nearest whole number)
Barium Ba 81 neutrons
Bismuth Bi 126 neutrons
Carbon C 6 neutrons
Hydrogen H 0 neutrons
Fluorine F 10 neutrons
Magnesium Mg 12 neutrons
Europium Eu 89 neutrons
Mercury Hg 121 netrons
10. Name the element which has the following numbers of particles:
a. 26 electrons, 29 neutrons, 26 protons
Iron (Fe)
b. 53 protons, 74 neutrons Iodine (I)
c. 2 electrons (neutral atoms) Helium (He)
Remember when using the Periodic Table--To get “mass number”, you must round the “atomic
mass” to the nearest whole number
Number Number
Number
Element
Atomic
Mass
Symbol
of
of
of
name
number number
Protons Neutrons Electrons
Helium
H
O
N3C
1+
Kr
2+
U
Ne
In
Cr
Nitrogen
Carbon
Na
Cu
Oxygen
4+
Ca
Sr
Pd or
Ag
V
Sodium
Krypton
Copper
Uranium
Neon
Indium
Chromium
Calcium
Strontium
Palladium
Silver
Vanadium
2
4
2
2
2
8
16
8
8
8
7
14
7
7
10
6
14
6
8
8
11
23
11
12
10
36
81
36
45
36
29
64
29
35
27
92
238
92
146
92
20
10
10
10
49
115
49
66
49
24
52
24
28
24
41
20
21
20
38
88
38
50
38
46/47
107
46/47
61/60
46/47
23
51
26
25
23
10
20