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WorksheetsScience 8 Quiz #3 3rd Quarter
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What is the basic unit of matter?
a)
Atom
b)
Molecule
c)
Cell
d)
Substance
2.
Which subatomic particle has a positive charge?
a)
Neutron
b)
Proton
c)
Electron
d)
Nucleon
3.
What do you call the center of an atom?
a)
Electron cloud
b)
Proton
c)
Nucleus
d)
Magnet
4.
Which subatomic particle has negligible mass?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleon
5.
What are protons and neutrons collectively called?
a)
Mass number
b)
Electrons
c)
Neutrons
d)
Nucleons
6.
What is the atomic number of an element?
a)
Number of neutrons
b)
Number of protons
c)
Number of protons and electrons
d)
Number of electrons
7.
How do you compute for the number of neutrons in an atom?
a)
Add protons and electrons
b)
Subtract atomic number from mass number
c)
Add protons and neutrons
d)
Divide mass number by atomic number
8.
What is the charge of an electron?
a)
-1
b)
1
c)
Neutral
d)
2
9.
What did Democritus call the smallest indivisible unit of matter?
a)
Electron
b)
Proton
c)
Atomos
d)
Nucleon
10.
Which scientist adapted Democritus' theory into a modern atomic model?
a)
John Dalton
b)
Joseph John Thomson
c)
Ernest Rutherford
d)
Niels Bohr
11.
What is the name of J.J. Thomson's atomic model?
a)
Nuclear model
b)
Plum pudding model
c)
Planetary model
d)
Quantum model
12.
What discovery did J.J. Thomson make about the atom?
a)
Atoms have a nucleus
b)
Atoms have electrons
c)
Atoms have neutrons
d)
Atoms have orbits
13.
What was the key observation from Rutherford's gold foil experiment?
a)
All particles passed through
b)
Some particles were deflected
c)
All particles bounced back
d)
Particles stuck to the foil
14.
What model did Rutherford propose for the atom?
a)
Plum pudding model
b)
Planetary model
c)
Quantum mechanical model
d)
Nuclear model
15.
How did Niels Bohr improve Rutherford's atomic model?
a)
By defining electron orbits
b)
By defining energy levels
c)
By adding neutrons
d)
By adding electron clouds
16.
According to Bohr, where do electrons reside?
a)
In the nucleus
b)
In fixed shells
c)
Around the nucleus
d)
Freely moving
17.
What does the Schrodinger model describe electrons as?
a)
As clouds of probability
b)
As waves
c)
As fixed particles
d)
As orbiting planets
18.
How is atomic mass determined?
a)
Number of protons
b)
Number of electrons
c)
Number of neutrons
d)
Number of protons and electrons
19.
What is represented by the atomic symbol?
a)
Mass of an atom
b)
Mass of protons and neutrons
c)
Number of protons and neutrons
d)
The weight of the element
20.
What is the atomic number of Magnesium (Mg)?
a)
11
b)
12
c)
24
d)
26
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