Chem 121 In-Class Assignment #2 (10 pts)
Names _________________________________________________________________
1. Give the symbol and name of the element described by the following:
a.
b.
c.
d.
e.
f.
g.
h.
i.
An alkaline earth metal in period 3
A noble gas in period 4
Group 4A, period 4
Group 15, period 3
An alkali metal in period 3
A halogen in period 5
An element with 67 protons
An element with 26 electrons
An element with an atomic mass of 186.2 amu
2. Give the number of protons, neutrons, electrons and the mass number for each of the
following isotopes:
a. 21H
b.
14
7N
c.
26
14H
d.
70
30Zn
3. Indicate the number of each in the following:
a. orbitals in the 4d sublevel
b. sublevels in the energy level n=1
c. orbitals in the 6p sublevel
d. orbitals in the energy level n=3
e. maximum electrons in the 4p sublevel
f. maximum electrons in the 5p sublevel
g. maximum electrons in the energy level n=5
h. maximum electrons in the 4f sublevel
4. The melting of polar ice is one way that freshwater enters the ocean. Because of
climate change we are seeing increases in the amount of freshwater entering the ocean
from melting ice caps on the poles. Based off of today’s density demo, what happens to
this freshwater when it enters the ocean—does it sink to the bottom? mix with the salty
ocean water? form a layer on the surface?
Given your answer above, why do you think scientists are so worried about what this
freshwater will do to the ocean? Think about how the freshwater may affect both marine
organisms and the ocean’s mixing.