CHEM 10050
Practice Exam 2
1.
Consider the element represented by the symbol below:
23
11
Na
a. What is its atomic number, Z? ______
b. What is its mass number, A? ______
c. How many protons does it have? ______
d. How many electrons does it have? ______
e. How many neutrons does it have? ______
2.
What is the maximum number of electrons in:
a. a p-subshell? ______
b. an s orbital? ______
c. the 3rd shell? ______
3.
How many electrons are in the valence shell of:
a. N ______
4.
b. Cl ______
c. Mg ______
Write the entire electron configuration for:
Fluorine ______________________________
Argon (Ar) ___________________________
5.
Write the entire electron configuration for the element with atomic
number Z = 16:
______________________________________
a. How many unpaired electrons does it contain? ________
b. How many valence electrons does it contain? _________
6.
In what period and group is an element with the following electron
configuration located?
[Ne]3s23p2
Period number ______
Group number ______
7.
Circle the element with the larger ionic radius:
8.
Circle the element with the larger ionization energy:
Na
or
Cs
9.
Circle the element with the larger electronegativity:
Li
or
F
10.
Write the correct formulas for the following ions or ionic
compounds:
11.
Be
or
O
a. Lithium ion _________________
b. Fluoride ion _______________
c. Magnesium ion _____________
d. Ammonium ion ____________
e. Sulfate ion _________________
f. Potassium oxide ___________
g. Calcium hydroxide __________
h. Lithium phosphate ________
i. Ferrous chloride ___________ __
j. Copper (I) bromide_________
Matching.
______The noble gases
a. Include F, Cl, Br, I
______The alkaline earth metals
b. Include Fe, Co, Ni, Cu, Zn
______The halogens
c. Include Li, Na, K, Rb, Cs
______The inner transition metals
d. Include He, Ne, Ar, Kr, Xe
______The alkali metals
e. Include Ce, Pr, Nd, Pm
______The transition metals
f. Include Be, Mg, Ca, Sr
12. True or False:
______An electron has a mass of 1 and a charge of –1.
______Protons and electrons are located within the nucleus of an atom.
______Isotopes are atoms with the same number of protons, but different
numbers of neutrons.
______Metals form cations by the gain of one or more electrons.
______A p-orbital is shaped like a dumbbell, and centered around the
nucleus.
______Mg and Ca form ions with a charge of –2.
______An ionic bond results from an electrical attraction between ions of
opposite charge.
______Ionization energy is the amount of energy required to remove an
electron from a gaseous atom.
______Nonmetals are typically located on the right side of the periodic
table.
______The farther from the nucleus, the greater the energy of electrons.
______The electron-dot symbol for beryllium is Be:
______Copper (II) ion is also known as cupric ion.
______4s orbitals are higher in energy than 3d orbitals.