9/25 what is the trend for electronegativity?
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Launch: 9/25 Grab your binder and immediately take a seat
Place Textbook HW on desk
5. The chart below shows the relationship between the first ionization energy and the increase in atomic number. The letter on the chart that represents the noble gases is:
a. W
b. X c. Y d. Z
What is the trend for electronegativity?
Mr. Heffner 9/25/09
Review: Atomic Radius In
crea
ses
Decreases
IV. Ionization Energy D
ecre
ases
Increases
V. Electronegativity A. What is electronegativity?
1. The ability of an atom to attract electrons toward itself in a chemical bond
H
H
O
V. Electronegativity B. What is the trend for electronegativity?
1. Electronegativity increases across a period (LR) i. As the number of protons increases, the nucleus gets
stronger and pulls all nearby electrons towards it
V. Electronegativity B. What is the trend for electronegativity?
2. Electronegativity decreases down a group (TopBottom) i. As the number of electrons increases, more rings are added
ii. The inner rings shield other electrons from the attractive forces of the nucleus
V. Electronegativity D
ecre
ases
Increases
Practice Questions See Periodic Trends Worksheet
Homework Study for Monday’s Unit #2 Exam!
Look over Quiz #3 Look over Exit Slips
lpschem.wordpress.com
Exit Slip 1. Electronegativity is the
a. energy it takes to remove an electron from an atom. b. number of protons and neutrons in an atom.
c. ability of an atom to attract electrons toward itself in a chemical bond
d. distance from the nucleus to the valence ring.
Exit Slip 2. In general, how does electronegativity vary
throughout the periodic table? a. it decreases across a period from left to right, and
decreases down a group from top to bottom b. it increases across a period from left to right, and
increases down a group from top to bottom c. it increases across a period from left to right, and
decreases down a group from top to bottom d. It decreases across a period from left to right, and
increases down a group from top to bottom
Exit Slip 3. Why does electronegativity decrease down a group?
a. Because atomic radius decreases b. Because the nucleus is shielded by the inner rings
c. Because the outer electrons are more strongly attracted by the nucleus
d. Because the trend for electronegativity increases down a group
Exit Slip 4. Which of the following atoms is more
electronegative than S? a. oxygen (O) b. phosphorus (P) c. selenium (Se)
d. magnesium (Mg)
Exit Slip 5. Which of the following atoms is the most
electronegative? a. sodium (Na) b. phosphorus (P) c. selenium (Se)
d. magnesium (Mg)
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