1. QUESTION:
Which type of element has the lowest electronegativity? A. a metal, B. a nonmetal, C. a metalloid
Electronegativity is a measure of the tendency of an atom to attract shared electrons.
General trend in electronegativity follows that of ionization energy. Across a period: Left to right: increasing Metallic elements are on the left – low EN. Nonmetallic elements are on the right – high EN.
SCRIPT:
Which type of element has the lowest electronegativity? A. a metal, B. a nonmetal, C. a metalloid
PAUSE
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Electronegativity is a measure of the tendency of an atom to attract shared electrons.
CLICK When atoms share electrons, the electrons are generally not shared equally. We say that the electrons are polarized towards the more electronegative atom.
The general trend in electronegativity follows that of ionization energy.
Across a period, from left to right electronegativity increases.
Metallic elements are the left side of the periodic table. They have low electronegativities.
In fact, atoms of metallic elements tend to lose up their electrons rather easily.
Nonmetallic elements are found on the right side of the periodic table. They have high electronegativities.
Metalloids are found in between.
Therefore, The correct answer is A.
Here’s a periodic table.
CONTINUED ON NEXT SLIDE

2. Increasing electronegativity
The metallic elements are shown here highlighted in red.
The nonmetallic elements are highlighted in blue.
And the metalloids are not highlighted.
CLICK Electronegativity increases from left to right.
CLICK
PAUSE
END RECORDING
Increasing electronegativity

3. Video ID: © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08