NEW
Font size
WorksheetsAtomic and mass numbers
Total questions: 30
Worksheet time: 24mins
If the atomic number of Pb (Lead) is 82 and its atomic mass is 205, how many neutrons does it have?
123
82
205
287
Hydrogen has an atomic mass of 3 and atomic number of 1. How many protons and neutrons does hydrogen have?
3 protons and 1 neutron
1 proton and 2 neutrons
2 protons and 1 neutron
1 proton and 3 neutrons
Which element is the heaviest?
Na
Ar
Which atom has an atomic mass of 16?
Na
Ar
Ca
O
An atom has an atomic number of 11 and an atomic mass of 23. Which of the following statements is correct?
It has 11 protons and 11 neutrons.
It has 11 electrons and 12 protons.
It has 11 protons and 11 electrons.
It has 23 protons and 11 electrons.
Which pair of particles contributes the most to the overall mass of the atom?
Electrons and protons
Protons and neutrons
Electrons and neutrons
The fluorine atom has an atomic number of
19
9
The fluorine atom has an atomic number of
19
9
What is the mass number and atomic number ?
Mass number = 7, atomic number = 14
Mass number = 14, atomic number = 7
In an element box, the number at top is the
atomic number
atomic name
atomic mass
atomic symbol
The chemical symbol in this element box is
26
Fe
Iron
55.845
What does the arrow for #14 represent?
Element Name
Symbol
Atomic Number
What does the arrow for #15 represent?
Symbol
Element Name
Atomic Mass
If hydrogen has 1 proton and 1 neutron, the atomic number = ----
1
2
If hydrogen has 1 proton and 1 neutron, the mass number = ----
1
2
What is the mass number of this atom?
1
3
4
7
An element has the mass number 12 and atomic number 6. The number of neutrons in it is:
6
10
4
8
Atoms of the same element which have a different number of neutrons are called _________________.
ions
isotopes
quarks
molecules
Isotopes have different numbers of
protons
neutrons
electron
properties
If an atom has 10 electrons, how many protons does it have?
0
1
10
5
How many electrons are in an atom with an atomic number of 50?
5
8
50
2
Atom 2 has Mass= 14 Electrons=6
Are these atoms isotopes of each other or different elements?
