3.03 Ionization energy & electronegativity trends

What is ionization energy?

• Energy needed to destroy an atom
• Energy required to remove an electron
• Energy needed to split an electron
• Energy required to add an electron

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Electronegativity is...

• how good an atom is at attracting electrons
• the ability of an atom to lose electrons
• the energy required to remove an electron from a specific atom
• how easy it is to make friends. 

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As you look down a group, ionization energy and electronegativity

• increases

• decreases

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As you look from left to right across a period, ionization energy and electronegativity both

• increase

• decrease

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Which element has the greater ionization energy?

• Magnesium (Mg)

• Phosphorus (P)

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Which element has the greater ionization energy?

• Iodine (I)

• Chlorine (Cl)

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Which has the greater electronegativity:

N or C?

• C

• N

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Which has the greater electronegativity:

Cl or Al?

• Cl

• Al

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What elements have zero electronegativity?

• metals
• nonmetals
• metalloids
• noble gases

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