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Unit 3 Electrons


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How many orbitals are in each of the following:
____ 3p sublevel
____ 2s sublevel
____ 4p sublevel
____ 3d sublevel

__3__ 3p sublevel
__2__ 2s sublevel
__4__ 4p sublevel
__4__ 3d sublevel

Arrange the following sublevels in order of increasing energy:

2p, 4s, 3s, 3d, 3p

2p, 3s, 3p, 4s, 3d
What is the maximum number of electrons allowed in each of the following sublevels?
___ d
___ s
___ p
___ f

_10__ d
__2__ s
__6__ p
_14__ f

Which of these sublevel designations is incorrect? Why?
4s 3f 2d 3d
d starts at 3d
Draw the orbital diagrams for the following elements:
a) silicon
b) calcium
c) sodium
d) iron

a) Si surrounded by 4
b) Ca surrounded by 2
c) Na surrounded by 1
d) Fe surrounded by 8

How many unpaired electrons are in each of the following:
a) Silicon
b) calcium
c) sodium
d) iron

a) 2
b) 0
c) 1
d) 4

What is meant by 3p^2?
It is the 2nd element of the 3p. Thus, Silicon.
Identify the element and symbol from its electron configuration:
1s^2 2s^2 2p^6 3s^2 3p^5
Chlorine Cl
Identify the element and symbol from its electron configuration:
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
Potassium K
1s^2 2s^2 2p^2
Carbon C
Identify the element and symbol from its electron configuration:
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7
Cobalt Co
Write the Electron Configuration for calcium.
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
Write electron configuration for nitrogen
1s^2 2s^2 2p^3
What is the contribution of Mendeleev and Moseley to the modern periodic table?
Mendeleev designed 90% of the table, and Moseley introduced atomic weight to eliminate anomolies.
Identify the following physical property as belonging to a metal, nonmetal, or metalloid:
a) Luster
b) Brittle
c) Ductile
d) Mostly gas at room temp
e) Malleable
f) Does not conduct electricity
g) Easily compressible
h) semi conduc
a) metal
b) metalloid
c) metal
d) non metal
e) metal
f) non metal
g) non metal
h) metalloid
i) metal

What chemical properties do lithium and sodium have in common? Why are their properties similar?
corrodes, highly reactive.

They are in the same family.

For each of the following, define the term and describe their trend o nthe periodic table:
a) Electronegativity
b) Atomic radius
c) Ionization Energy

a) tendancy of an atom to attract electrons. affected by atomic number and and its distance its valence electrons reside

b)measure of the size of the atoms.

c) ability to lose or gain electrons. on the period table, going down is loss, going across is gain.

Per octet rule, which element is the most reactive non metal? why?

which element is the most reactive metal?

Most stable when has 8 electrons per octet rule.

most reactive nonmetal is Fluorine.
most reactive metal is Francium.

Cesium is a (metal/nonmetal) and will (lose/gain) electrons to form (positive/negative) ions called (cations/anions). This is due to (low/high) ionization energy.
metal, lose, postive, cations, low
Sulfur is a (metal/nonmetal) and will (lose/gain) 2 electrons to form (positive/negative) ions, called (cations/anions). This is due to (low/high) electronegativity.
nonmetal, gain, negative, anions, high
Will Cesiuma and Sulfur for a bond? If so what type of bond? Describe the formation of the bond.
Name the compound formula CuCl2.

Indicate the cation, anion, and molar mass.

Copper Chloride

Cation = Cu+1
Anion = Cl-1
Molar Mass = 63.548 + 35.453*2

Ammonium Phosphate. What is the cation, anion, compound formula, molar mass.
(NH4)3 PO4
cation = NH +4
anion = PO4


Define Metallic Bond.
The chemical bond characteristic of metals, in which mobile valence electrons are shared among atoms in a usually stable crystalline structure.
Describe the contributions, experiments, models for:

Dalton defined law of conservation of mass.

Thomson discovered the electron,

Rutherford and his teams discovered the proton then neutron;

Bohr is credited for having developed the concept of orbitals and a solar system-like arrangement of the electrons around the nucleus

What is the wavelength of an electromagnetic wave with a frequency of 45 Hz?
wavelength = wave speed ÷ frequency

For electromagnetic waves such as light and radio waves, the speed is the speed of light defined at 299,792,458 meters per second.

thus, 299792458 / 45

What is the frequency of an electronic wave with wavelength of 8.10x10^4m
wavelength = wave speed ÷ frequency

8.10x10^4m = (speed of light) / frequency
= speed of light/ 8.10x10^4m

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