WorksheetsY8 Atomic structure
Total questions: 28
Worksheet time: 31mins
Isotopes of an element contain an equal number of protons but a different number of ____________________.
neutrons
electrons
atomic numbers
How many protons are in the isotope pictured above?
29
34
63
92
How many neutrons are in the isotope pictured above?
29
34
63
92
The mass number of an isotope is made up of which subatomic particles?
protons and electrons
protons and neutrons
electrons and neutrons
protons, neutrons and electrons
What is the number of protons in phosphorus-31?
15
16
31
46
The atomic number of an element is the total number of which subatomic particle found in the nucleus?
Electron
Neutron
Proton
Neutrons + Protons
An unknown element has two naturally occurring isotopes. One has a mass of 10.01 amu and % abundance of 19.8%. The other has a mass of 10.99 amu and % abundance of 80.2%. Calculate the atomic mass.
1079.6
107.95 amu
21 amu
10.8 amu
Element X has 13 neutrons with a mass number of 28. Element Y has 13 protons. These elements are:
Different elements
Isotopes
Element Q has 56 protons and 18 neutrons.
Element R has 56 protons and 17 neutrons. These elements are:
different elements
isotopes
What is the mass number of an element with 11 protons and 12 neutrons?
1
11
12
23
Which of the following have the same MASS NUMBERS? (You must choose more than one answer)
scandium - 46
sodium - 21
titanium -46
boron - 11
How many electrons are in a neutral atom of magnesium?
10
12
24
24.3
What is the number of protons in neon - 22?
10
12
22
32
Which subatomic particles are found in the nucleus of an atom? Choose all that apply.
protons
neutrons
electrons
alpha
In which of the following is the number of neutrons correctly represented?
chromium - 50 has 24 neutrons
silver - 108 has 60 neutrons
zinc - 67 has 37 neutrons
carbon -14 has 6 neutrons
(1802) What is the number of protons that the element in this image contain?
14
7
15
18
What is an isotope?
A charged atom
Two atoms of the same element with different amounts of neutrons
Two atoms of the same element with different amounts of protons
A neutral atom
What is the mass of an electron?
1 amu
negligible
The most penetrating form of nuclear radiation is...
alpha
beta
gamma
heat
Which best describes the structure of a beta particle?
helium nucleus
slow moving proton
fast moving electron
high frequency light wave
What is the half-life of this radioactive substance?
5700 years
11400 years
17100 years
22800 years
A source of background radiation is...
cosmic rays from the Sun
radon gas in the air
radioactive isotopes in food
radioactive minerals in the earth
A radioactive source has an initial activity of 200kBq and a half-life of 15 days. How many days would it take for the activity to fall to 25kBq?
15
30
45
60
