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WorksheetsAtoms & Bohr Models
Total questions: 21
Worksheet time: 13mins
___________________ are the basic building-block of all matter.
protons
masses
volume
atoms
Which one is the smallest?
a rabbit
a bacteria
an atom
a proton
Which one is the smallest?
a proton
a neutron
an atom
an electron
It would take about _________________________ protons or neutrons put side-by-side to equal a centimeter.
One million
One hundred million
One hundred billion
One hundred trillion
Proton has a (a) charge.
Electron has a (a) charge.
Neutron has (a) charge.
Protons and neutrons are located
In the nucleus of the atom
Outside the nucleus of the atom
In the cell nucleus
Outside of the atom
Which element has 3 protons?
Hydrogen
Helium
Lithium
Carbon
Who developed the Bohr model of the atoms?
Marie Curie
John Dalton
Niels Bohr
Dmitri Mendeleev
Horizontal rows on the Periodic Table are called
groups.
atomic numbers.
atomic mass.
periods.
Horizontal rows on the Periodic Table are called (a) .
Carbon is in Period 2, how many rings ( energy levels) should carbon atom have?
1
2
3
4
How many electrons are in an carbon atom?
(a)
Sodium (Na) & Magnesium (Mg) both in the third row in period table, so they both will have __ rings.
1
2
3
4
(a) are the building blocks of all matter.
Molecules are made of ______________ atoms.
one
two or more
three or more
a hundred
If a proton or electron is lost, an atom will be ___________ .
charged
positive
negative
neutral
Table salt is formed by _______________.
sodium and chlorine
hydrogen and oxygen
sodium and carbon
carbon and oxygen
The element ratio of hydrogen to oxygen in H2O is
1:1
1:2
2:1
2:3
The element ratio of carbon to oxygen in CO2 is
1:1
1:2
2:1
2:3
