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WorksheetsHistory of an Atom
Total questions: 25
Worksheet time: 42mins
What Greek philosopher first spoke about the idea of an atom?
Democritus
Thomson
Dalton
Rutherford
Which scientist developed the atomic theory?
Thomson
Rutherford
Dalton
Chadwick
What did Thomson discover?
Electron
Proton
Neutron
Electron Cloud
Who discovered the nucleus and protons?
Rutherford
Thomson
Dalton
Democritus
Who discovered the neutron?
Chadwick
Dalton
Borh
Democritus
Match the atomic model to the scientist.
Rutherford
Bohr
Thomson
Dalton
Schrodinger
Who proposed a model with electrons moving in specific orbitals?
Dalton
Rutherford
Bohr
Thomson
Chadwick
If oxygen has 8 protons, then how many neutrons does it have?
9
16
8
7
The mass number is the sum of what two parts of an atom?
proton and neutron
proton and electron
electron and netron
none of the above
Fluorine has a mass number of 19. It has 10 neutrons. How many protons does it have?
10
9
8
7
How do you know how many electrons an atom has if you know how many protons it has?
You add them together to equal the atomic number.
There is no way of knowing
You add as many electrons as you need to get to the mass number.
There must be an equal amount of protons and electrons.
If argon has 18 protons, then how many electrons does it have?
18
17
16
15
What does the atomic number of an element represent?
The number of protons in the nucleus
The number of neutrons in the nucleus
The total number of protons and neutrons in the nucleus
The total number of protons and electrons in an atom
How can you determine the number of neutrons in an atom if you know its atomic number and mass number?
mass number - atomic number
mass number + atomic number
mass number x atomic number
mass number ÷ atomic number
Match the following
Neutron
Neutral (No Charge)
Proton
Positive
Electron
Negative
Smallest of the 3 subatomic particles
protons
neutrons
electrons
What does each square on the periodic table show? Check all that apply.
Name
Symbol
Mass number
Atomic number
Atomic mass
What element is represented in this Bohr Model?
What is the atomic mass of the element shown?
14
28
28.086
