Electron Affinity Trend

What does the first electron affinity measure?

• Energy released during the formation of a mole of covalent bonds

• Energy required to break a mole of ionic bonds

• Energy released when an electron is added to a gaseous atom

• Energy absorbed when an electron is removed from a gaseous atom

Why are first electron affinity values typically negative?

• Because energy is absorbed

• Because energy is released

• Due to electron repulsion

• Due to electron attraction

Tags

NGSS.HS-PS1-4

What is the nature of the second electron affinity?

• Always exothermic

• Always endothermic

• Depends on the element

• Neutral

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NGSS.HS-PS1-4

What factor does NOT affect electron affinity?

• Color of the element

• Nuclear charge

• Electron shielding

• Atomic radius

How does the first electron affinity change down a group in the periodic table?

• First increases then decreases

• Remains constant

• Decreases

• Increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why are second electron affinity values positive?

• Due to increased nuclear attraction

• Because energy is released

• Due to extra repulsion when adding an electron to a negative ion

• Because they are always exothermic

Tags

NGSS.HS-PS1-4

Which group shows a decrease in first electron affinity from top to bottom?

• Group 16

• Group 1

• Group 17

• All of the above

What trend is observed in the first electron affinity across a period?

• Remains the same

• Generally increases

• Generally decreases

• First decreases then increases

Tags

NGSS.HS-PS1-1

Which element has an endothermic second electron affinity?

• Both oxygen and sulfur

• Oxygen

• Neon

• Sulfur

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What exception is noted in the trend of first electron affinity across a period?

• There are no exceptions

• It increases for alkali metals

• Some elements show a decrease due to their electronic configuration

• It decreases for noble gases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2