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WorksheetsGrade 8 - Atom, Molecules and Elements
Total questions: 20
Worksheet time: 41mins
How many atoms of Hydrogen are in this compound?
1
2
3
4
What is the chemical symbol for Hydrogen
H
He
Hy
Hg
Which number here is the atomic number?
5
10.811
What is this table
Elemental Table of Periods
Atomic Table of Atoms
Periodic Table of Elements
What is the symbol for Krypton?
Kr
kr
KR
All of them are right.
H₂O is a compound molecule.
TRUE
FALSE
O2 is a compound molecule.
TRUE
FALSE
Group of atoms bonded together
Mixture
Compouns
Atom
Molecules
What is the picture displayed?
atom
element molecule
compound molecule
Are these molecules also compounds?
YES
NO
Which of the following is NOT a compound?
HCl
Cl2
NaCl
CO2
This picture represents which of the following?
elemental molecule
compound molecule
What is the symbol for Helium?
He
HE
he
All of them are right.
Which of the following is a compound molecule?
H2O
O2
N2
Ar
What is the atomic mass of O2?
15
16
30
32
