Chemical Changes and Structure
Atoms, Elements and Compounds NAT 5
Homework Three
1.
Isotopes of the same element have
A. the same atomic number and the same mass number
B. a different atomic number and the same mass number
C. the same atomic number and a different mass number
D. a different atomic number and a different mass number
2.
(1)
Isotopes of the same element have identical
A. nuclei
B. mass numbers
C. numbers of neutrons
(1)
D. numbers of protons
3.
The table shows the numbers of protons, electrons and neutrons in four
particles, W, X, Y and Z.
Particle
Protons
Electrons
Neutrons
W
17
17
18
X
11
11
12
Y
17
17
20
Z
18
18
18
Which pair of particles are isotopes?
A. W and X
B. W and Y
C. X and Y
D. Y and Z
(1)
4. The element boron contains two types of atoms, of mass numbers 10 and 11.
This tells us that
A. the relative atomic mass of boron will be between 10 and 11
B. the relative atomic mass of boron will be less than 10
C. the boron atom of mass number 10 will be more reactive than that of
mass number 11
D. the boron atom of mass number 11 will have more electrons in the atom
than that of mass number 10
5.
(1)
The isotopes of carbon and oxygen are given in the table.
A molecule of carbon dioxide (CO2) with a mass 46 could contain
A. one
12
C atom and two 16O atoms
B. one
14
C atom and two 18O atoms
C. one
12
C atom, one 16O atom and one 18O atom
D. one
14
C atom, one 16O atom and one 18O atom
(1)
6. a) To which family of metals does copper belong?
hhhh(You may wish to use your data booklet to help you)
(1)
b) Copper is made up of two different types of atom.
i) Complete the table to show the number of protons and neutrons in each
type of copper atom
Number of protons Number of neutrons
63
329
65
329
Cu
Cu
(2)
ii) What term is used to describe the different types of copper atoms?
7.
(1)
Tritium is a naturally occurring isotope of hydrogen. It can be
represented as
3
1
H
a) Complete the table to show the number of particles in an atom of
tritium
Type of particle
proton
neutron
electron
Number of particles
(2)
b) Hydrogen has three isotopes.
Isotope of hydrogen
protium
deuterium
tritium
Mass number
1
2
3
The relative atomic mass of hydrogen is 1.
Which isotope of hydrogen is most abundant?
8.
(1)
The nuclide notation for an isotope of hydrogen is
a) An isotope of bromine has atomic number 35 and mass number 81.
i) Complete the nuclide notation for this isotope of bromine
(1)
Br
ii) How many neutrons are in this isotope?
(1)
b) Bromine has two isotopes. One has a mass number of 81 and the other
has a mass number of 79.
The relative atomic mass of bromine is 80.
What does this tell you about the percentage of each isotope in bromine?
(1)