do now- 3/14 thursday today’s learning...
TRANSCRIPT
DO NOW- 3/14 Thursday
1. How many protons, neutrons, and electrons does lithium have?
2. Draw the Bohr model and Lewis dot model for Lithium.
Lithium metal is extremely explosive. Today’s Learning TargetLT1E: I can use the ionization energy, electronegativity, ionic radius and atomic radius trends on the periodic table to make predictions about characteristics of the elements.
ELECTRONEGATIVITY “to make more negative”
The ability of an atom to ATTRACT electrons.
ELECTRONEGATIVITY
“To make more negative”The ability of an atom to
ATTRACT electrons.
THINK...
1. Which subatomic particle is attracted to electrons?
2. How can an atom attract more electrons?
3. For Nitrogen (N), Oxygen (O), Fluorine (F), which element attracts electrons the
strongest?
Electronegativity increases
IONIZATION ENERGY
“to make into an ion” The energy required to REMOVE
an electron from an atom.
“To make into an ion”The amount of energy required to
REMOVE an electron from an atom.
IONIZATION ENERGY
THINK...
1. As electronegativity increases (check your periodic table to see which direction), are the
electrons more or less attracted to the nucleus?
2. For Nitrogen and Oxygen, which element has higher electronegativity?
3. Which element requires more energy to remove 1 of its electrons?
Electronegativity increases
Ionization energy increases
The size of an atom.
ATOMIC RADIUS THINK...
1. Compare Nitrogen and Fluorine. Which one has higher electronegativity? (Hint: look at the
trend we just discovered in your notes.)
2. As electronegativity increases, do the electrons move closer or farther from the
nucleus?
3. For Nitrogen and Fluorine, which element has a larger atomic radius?
Electronegativity increases
Atomic radius decreases
Ionization energy increases
As you move from top to bottom on a periodic table, the number of energy levels increases!
This will ________ the atomic radius.
Electronegativity increases
Atomic radius decreases
Atom
ic ra
dius
incr
ease
s
Ionization energy increases
ELECTRONEGATIVITY “to make more negative”
The ability of an atom to ATTRACT electrons.
Can’t see the girl!
covering up the girl:
“shielding”
Electron shielding: occurs when there is more than one electron energy level. This level
decreases the attraction between the nucleus and the electrons.
Can’t see the nucleus!
covering up the nucleus: “shielding” Electronegativity increases
Atomic radius decreases
Atom
ic ra
dius
incr
ease
s
Elect
rone
gati
vity
decr
ease
s
Ioni
zatio
n en
ergy
decr
ease
s
Ionization energy increases
ionAn atom with missing OR
additional electrons.It is NOT neutral.
- -- --
-- --
+
+++
++ +
+
-+
+ +
+
-- --
--+ +
+ +--
++
negative neutralpositive
additional missing equal
size of atom with additional or missing electrons.
ionic radius
Electronegativity increases
Atomic radius decreases
Atom
ic ra
dius
incr
ease
s
Elect
rone
gati
vity
decr
ease
s
Ioni
zatio
n en
ergy
decr
ease
s
Ionization energy increases
Ioni
c rad
ius in
crea
ses
Ionic radius decreases