Periodic Trends

What does electronegativity mean?

• ability to increase energy levels

• ability to react with elements

• ability to attract electrons

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In the alkali metals, which element has a larger atomic radius?

• lithium, Li

• sodium, Na

• potassium, K

• cesium, Cs

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In the halogen family, which element is the most electronegative?

• iodine, I

• fluorine, F

• chlorine, Cl

• helium, He

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Looking at period 3, which element has the smallest atomic radius?

• Mg

• Cl

• Al

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How do scientists measure the size of atoms?

• by counting energy levels

• measuring the distance between 2 nuclei

• measuring the nucleus

• using the atomic number

As you move across a period, what happens to the nuclear charge in the atoms?

• It increases because more protons are added.

• It decreases because protons are taken away.

• It stays the same.

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What idea is this cartoon showing?

• chlorine is more electronegative than hydrogen

• chlorine has more energy levels than hydrogen

• hydrogen is more electronegative than chlorine

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In group 2, which of these elements has the largest atomic radius?

• Ba

• Mg

• Ca

• La

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Which of the following elements is the most electronegative?

• Hydrogen, H

• Aluminum, Al

• Oxygen, O

• Cesium, Cs

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Which of these halogens has the largest atomic radius?

• fluorine, F

• chlorine, Cl

• bromine, Br

• iodine, I

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