Worksheetsatoms and elements
Total questions: 20
Worksheet time: 15mins
An atom is a . . .
building block of life.
basic unit of matter.
An element is a pure substance that is made from only one type of ______.
compound
atom
molecule
There are approximately ___ known elements. These are all listed in the periodic table.
100
500
1,000
Atoms consist of three different types of subatomic particles called protons, neutrons and (a) .
The (a) of an atom contains protons and neutrons.
The electrons of an atom are held in . . .
a nucleus in the central region of the atom.
shells surrounding the nucleus.
An electron has a (a) relative mass.
An electron has a relative charge of ___.
+1
0
-1
A proton has a relative mass of (a) .
A proton has a relative charge of ___.
+1
0
-1
A neutron has a relative mass of (a) .
A neutron has a relative charge of ___.
+1
0
-1
In particle diagrams, atoms are often represented by different circles. The different colours and sizes represent different elements. How many atoms are represented in the particle diagram shown?
(a)
In particle diagrams, atoms are often represented by different circles. The different colours and sizes represent different elements. How many elements are represented in the particle diagram shown?
(a)
Atoms can bond with other atoms to form molecules. How many atoms are represented by the particle diagram?
(a)
Atoms can bond with other atoms to form molecules. If all of the atoms in a molecule are of the same element, then the molecule can be described as a molecule of an element. How many elements are represented in the particle diagram?
(a)
Which of these particle diagrams represents unbonded atoms of one element?
A
B
C
D
Which two diagrams represent molecules of one element?
A
B
C
D
Which of these diagrams represents only molecules of one element?
A
B
C
D
Which of these diagrams represents only unbonded atoms of one element?
A
B
C
D
