10.
The chart shows the electronegativity values as the elements are arranged on the periodic table.
Electronegativity Values for Atoms of Selected Elements
Hydrogen
H
2.1
Lithium
Li
1.0 Beryllium
Be
1.5 Boron
B
2.0 Carbon
C
2.5 Nitrogen
N
3.0 Oxygen
O
3.5 Fluorine
F
4.0
Sodium
Na
0.9 Magnesium
Mg
1.2 Aluminum
Al
1.5 Silicon
Si
1.8 Phosphorus
P
2.1 Sulfur
S
2.5 Chlorine
Cl
3.0
Potassium
K
0.8 Calcium
Ca
1.0 Gallium
Ga
1.6 Germanium
Ge
1.8 Arsenic
As
2.0 Selenium
Se
2.4 Bromine
Br
2.8
Which statement BEST describes the electronegativity values of the elements shown?
Electronegativity decreases with increasing atomic number within a group.
Electronegativity tends to be lower in the gases than in the solids.
Electronegativity decreases with increasing atomic number within a period.
Electronegativity tends to be higher in the metals than in the nonmetals.