# isotope practice

```Name:
Use isotope notation to determine: element name/symbol, atomic number, number of electrons,
number of neutrons, number of protons, mass number, atomic number, atomic mass.
Isotope Notation:
12
13
14
1. Here are three isotopes of an element:
6 C
6 C
6 C
a. The element is: _carbon____
b. The number 6 refers to the ___atomic number or number of protons_______
c. The numbers 12, 13, and 14 refer to the _____the number of neutrons_____
d. How many protons and neutrons are in the first isotope? _6 protons 6 neutrons_
e. How many protons and neutrons are in the second isotope? _6 protons 7 neutrons
f. How many protons and neutrons are in the third isotope? _6 protons 8 neutrons_
2. Complete the following chart:
Isotope name
atomic #
mass #
# of protons
# of neutrons
# of electrons
92 uranium-235
92
327
92
143
92
92 uranium-238
92
330
92
146
92
5 boron-10
5
15
5
5
5
5 boron-11
5
16
5
6
5
3. Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153.
Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of
51.97%. What is the atomic mass of europium?
Element
Symbol
Atomic
Number
Helium
Titanium
Tantalum
Gallium
Carbon
He
Ti
Ta
Ga
C
2
22
73
31
6
Number
of
electrons
2
22
68
28
10
Number
of
Neutrons
2
28
108
39
7
Mass
number
4
50
63
38
2
Isotope
Notation
Ti - 50
13 -4
C
6
Ra
88
88
245
Bi
83
83
127
42
226
88
Bismuht
223
Atomic
Mass
Ra
```