Download Unit 3 Review

Unit 3 Review
Question 1
In his gold foil experiment, Rutherford found
most particles went straight through the gold foil,
but a few bounced back at him, what did he
determine about the atom from these results?
Atom mostly empty space
Atom has a small, dense positively charged
cener
Question 2
What do the following numbers tell you about
an atom?
Mass number- number of protons and
neutrons an atom has
Atomic mass- average mass of all isotopes of
an element
Atomic number- number of protons an atom
has and number electrons a neutral atom has
Question 3
What are isotopes?
Atoms of the same element with different
numbers of neutrons
Important: the amount of protons stays the
same!
Question 4
How do the isotopes Be-8 and Be-9 differ? (think
about what the numbers represent)
Be-8 has 4 protons and 4 neutrons
Be-9 has 4 protons and 5 neutrons
Question 5
As the atomic number increases as you move
across the periodic table, what happens to the
number of protons and electrons in an atom?
They also increase ex. C has 6 protons, N has 7
protons
Question 6
What is the atomic mass of N-14?
14.01 amu
Question 7
How many neutrons does N-14 have?
14= 7 protons + n
n= 7
Question 8
How many electrons can each of the following
sublevels hold?
 s- 2
 p- 6
 d- 10
Question 9
What does the quantum mechanics model of
the atom tell us about the location of electrons?
It tells us that electrons exist in 3-D space around
the nucleus, it can tell us the probability of
where an electron is about 90% of the time
Question 10
As you move further away from the nucleus, do
electrons have more or less energy?
More energy
Question 11
How many total electrons are in each of these
principal energy levels? (Fill out the chart to get
your answer)
Energy Level
Total Number of orbitals
(s, p, d)
Total Number of
Electrons
1
1
2
2
4
8
3
9
18
Question 12
What are the rules for orbital notation?
Question 13
List the atomic orbitals in increasing energy
order starting at 1s2 and ending at 5s2
1s22s22p63s23p64s23d104p65s2
Question 14
 What is wrong with this orbital diagram?
 There should not be a down arrow in 2p, it should be
an up arrow in the 2nd box