Problem set # 2
Chemistry 100
Name:
1. What is the mass number and Atomic number of these unknown elements?
a) 12 protons, 12 electrons, and 12 neutrons.
b) 35 protons, 35 electrons, and 45 neutrons.
c) 94 protons, 94 electrons, and 130 neutrons.
2. Find the names and symbol of elements in question 1.
3. The two most abundant naturally occurring isotopes of carbon are carbon-12 (98.90%,
12.000 amu) and crbon-13 (1.10%, 13.003 amu). Calculate the atomic weight of carbon.
4. Circle the metals and draw a box around the nonmetals:
Fe
Rb
Ar
Ag
N2
Br2
Al
Xe
Sr
At
As
5. Verify the charge of these ions and correct them:
Na2+
Cl3+
O3-
Be2-
P4-
Ca4+
6. Fine the number of protons, electrons, and neutrons for the following atoms/ions:
a)
208
Pb
82
b)
33
15 P
c)
32 2S
16
7. How many electrons are contained in each of the ions?
a) Fe2+
b) Cl-
c) K+
d) O2-
e) Mg2+
f) S2-
Dr. Behrang Madani
Chemistry 100
IVC