Quiz: Matter & The Atom (Open Notes)
Name____________________________
Indicate the number of atoms in each of the following elements or compounds and name the
elements:
Ex. C6H12O6
6-carbon, 12-hydrogen, 6 oxygen
Symbol
Name and number of each element
1.
Cu
________________________________________________
2.
KI
________________________________________________
3.
NO2
________________________________________________
4.
H2SO4
________________________________________________
5.
Identify the atomic number of the element of bitriennium. _________
6.
What name and symbol would you give to a newly synthesized atom with an atomic number of
123? _____________________________________________________________________
7.
Write the definition of the term atom ______________________________________________
____________________________________________________________________________
8.
The newest atomic model that describes the atom as a tiny, dense, positive nucleus surrounded
by a cloud of negative charge is the ______________________ ___________________ model.
9.
Define an electron. _____________________________________________________________
10. T or F A neutron carries a positive charge.
11. T or F A proton has a charge that is equal in force but opposite in charge to each electron.
12. T or F Protons and electrons are about equal in mass.
13. T or F The mass of an atom depends on the number of protons and neutrons in its nucleus.
14. The atomic number of an atom is determined by the number of ______________.
15. What is the formula for the mass number of an atom? ______________________
16. Atoms of the same element with different numbers of neutrons are called ______.
17 - 18. The following isotope symbol represents 2 pieces of information. Identify each part on
the appropriate arrow.
17.
C - 14
18.
19. Two isotopes of the element Boron exist, B - 10 and B - 11. Calculate the average atomic mass
of our Boron sample if…
 Boron - 10 occurs 22% of the time
 Boron - 11 occurs 78% of the time.
______________________
20. Calculate the number of protons, neutrons & electrons in each of the following isotopes.
Element
Protons
Neutrons
Electrons
Tl-203
Pt-192
Pb
21. Why can’t Titanium have a mass number of 18? ______________________________________
_________________________________________________________________________________
Extra Credit: A particular sample of neon has 3 naturally occurring isotopes with an average
atomic mass of 20.1872 u. Ne-20 occurs 90.5% of the time, and Ne-21 occurs 0.28% of the
time. Calculate the mass number and percentage of occurrence of the missing isotope of Neon.
You must show all work to gain credit.