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WorksheetsThe Atom
Total questions: 31
Worksheet time: 19mins
While making his model of an atom, what structure did Rutherford discover?
the nucleus
the electron cloud
the quarks
the atomic mass
In Dalton's Atomic Theory, all elements consist of indivisible particles called __________ .
atoms
parts
molecules
hydrogen
Which of the following is/are conclusions based on Rutherford’s gold foil experiment?
The atom is mostly empty space.
The nucleus is positively charged.
The atom has a small dense nucleus.
All answers are correct
Which scientist discovered that the nucleus contained neutrons?
Bohr
Rutherford
Dalton
Chadwick
Bohr proposed that electrons are located in
the nucleus.
inside protons.
electron cloud.
circular orbits around the nucleus.
Whose atomic model is shown?
Dalton
Thomson
Rutherford
Bohr
Where are electrons of an atom found?
Nucleus
Electron Cloud
Some are in the nucleus and some in the electron cloud.
They are moving everywhere.
What carries no charge?
Neutrons
Electrons
Protons
The central region of an atom where its neutrons and protons are is its
nucleus
electron cloud
core
center
In a neutral atom, what is the number of protons equal to?
The number of electrons.
The number of neutrons.
The number of molecules.
The number of nuclei.
Which of these determines the identity of an atom?
proton
neutron
valence electron
protons and neutrons
Which of these determines the reactivity of an atom?
proton
neutron
electron
protons and neutrons
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
15
31
16
47
What is the mass number?
6
7
3
How many protons are in one atom of lithium?
3
6
7
4
How many electrons are in one atom of lithium?
3
6
7
4
What is the densest part of an atom?
energy levels
electrons
protons
nucleus
If an atom contains 12 protons, 11 electrons and 12 neutrons, what is its charge?
It is neutral.
+1
-1
