WorksheetsElements and substances
Total questions: 25
Worksheet time: 16mins
What are molecules?
Molecules are combinations of two or more atoms.
Molecules are the parts that make up atoms
Molecules are the gaseous parts of atoms
Molecules are atoms that have a positive charge
Elements are made up of how many types of atoms?
more than 1
2
3
1
Water (H2O) is an example of a/an...
element
compound
ion
atom
sodium chloride (salt) is example of ...
atomic substance
molecular substance
ionic substance
alloy
Which one is a compound?
Ni
F
Re
NaCl
How many different elements are in the compound?
12
3
24
6
This picture represents:
atomic substance
molecular substance
ionic substance
alloy
What is the atomic mass of the element?
6
Carbon
12
7
How many protons does a Magnesium atom have?
13
14
26
27
How many neutrons does an Aluminum atom have?
13
14
26
27
The element in the diagram is neutral because...
Number of proton same as number of neutron
Number of electron same as number of proton
Number of electron same as number of neutron
Number of proton same as nucleon number
How are the elements arranged on the periodic table?
Proton number
Atomic mass
Number of neutron
Nuclear number
What are the characteristic for elements in the same group of the Perodic Table?
Same valence electron
Same proton number
Same chemical properties
Same nucleon number
What characterics can be found for a matter?
Has size
Has shape
Has mass
Occupy space
Which of the following is not a compound?
O
CHO
NaCl
CHLi
The smallest unit of a matter is known as...
particle
compound
element
atom
If two atoms have the same amount of protons, but a different amount of neutrons, they are known as isotopes.
True
False
An atom has 8 protons and 8 neutrons. Which of the following is an isotope of this atom?
8 protons and 8 neutrons
9 protons and 8 neutrons
8 protons and 6 neutrons
3 protons and 7 neutrons
Element X has 11 electrons.
Which of the following is the correct electron arrangement for element X?
2.9
2.8.1
11
1.1
Iodine-131 has 53 protons. Find the nucleon number for element iodine.
53
131
184
78
Ion Cl- has 17 protons. Which of the following is the correct electron arrangement of ion Cl-?
2.8
2.8.2
2.8.8
2.8.7
What is X?
Neutron
Proton
Electron
Nucleon number
