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Name ____________________________________________ Hour ______________
Follow the clues to find the atomic number of a mystery element. Write the element’s
name in the answer blank.
Element 1
1. Add the atomic # of Ni to the
atomic # of Pb.
2. Divide by the # of p+ in Na.
3. Subtract the rounded atomic
mass of He.
Element 2
1. Add the # of p+ in Ca to the # of
neutrons in N.
2. Divide by the atomic # of Co.
3. Multiply by the # of e- in Sn.
Element 3
1. Add the # of p+ in Ne to the # of
p+ in Ar.
2. Divide by the atomic # of He.
3. Multiply by the # of neutrons in Li.
4. Divide by the rounded atomic
mass of N.
Element 4
1. Multiply the # of e- in Magnesium
and the # of p+ of Carbon.
2. Divide by the # of n˚ in oxygen.
3. Multiply by the rounded atomic
mass of Boron.
Element 5
1. Multiply the atomic # of He by
atomic # of Ne.
2. Add the # of e- in Ca.
3. Add the rounded atomic mass of
4. Divide by the # of p+ in F.
5. Add the atomic # of Zn.
Element 6
1. Add the # of p+ of Cl to the # of
p+ of arsenic.
2. Divide by the # of n˚ in Neon.
3. Multiply by the atomic # of
Answer __________________________
Element 7
1. Add the # of p+ in sulfur to the #
of n˚ in Bromine.
2. Subtract the # of p+ in Nitrogen.
3. Divide by the # of e- in Fluorine.
4. Add the # of p+ in gold.
5. Subtract the # of p+ in Lithium.
Answer _________________________
Element 8 *Extra Credit*
Add the # of p+ in iodine to
the atomic # of iron.
Subtract the # of n˚ in Lithium.
Divide by the atomic # of the
element that has the symbol of
our state.
Add the atomic # of the
element that sounds like it
would make Superman weak.
Add the # of p+ of the
element found in bananas.
Add the # of e- from the
element with a ½ life of 1602
years, discovered by Marie
Subtract the atomic # of the
only liquid metal at room
Answer __________________________
Name ____________________________________________ Hour ______________
Ch. 3 Book Assignment- The Atom
The word atom comes from the Greek word meaning what? _______________________
Ancient Greeks, like ______________________________ and _______________________
hypothesized about the atom, but were unable to run experiments on it.
What does the law of conservation of mass state?
After looking at a summary of John Dalton’s 1808 Atomic Theory, which 2 statements are
not true? (Continue reading ‘Modern Atomic Theory’ if you’re not sure)
Define atom.
What is the nucleus? Should it have a positive or negative charge?
List 3 subatomic particles: __________________________________________
Who discovered electrons? __________________________________
Who discovered the mass of an electron? __________________________
Who discovered the nucleus? _________________________________
What are the forces called in the nucleus that hold the protons and neutrons together,
even though like charges should repel? ______________________________
Define atomic number.
Define isotope (p. 76)
Isotopes have a different number of which subatomic particle? __________________
Because isotopes have different numbers of _____________________, they have different
How could you find the mass number of an element? ___________ + ____________
Uranium-238 contains ___________ protons and ___________ neutrons.
What does a mole measure in chemistry? (p. 81) __________________________________
Avogadro’s number rounded is: ____________________________