Unit 2, Chapter 3 Periodic Trends

Choose the accurate description for the following periodic trend. Atomic radius ______ from left to right within a period.

• Decreases

• Increases

• Stays the same

Choose the accurate description for the following periodic trend. Atomic radius ______ from top to bottom within a group.

• decreases

• increases

• stays constant

Why does atomic radius decrease across a period?

• shielding increases so Zeff decreases

• Protons increase so Zeff increases

• shielding increases so Zeff increases

• Protons increase but Zeff stays constant

Tags

NGSS.HS-PS1-1

Why does atomic radius increase down a group?

• Valence electrons increase down a group

• Shielding electrons increase down a group

• Valence electrons remain constant down a group

• Shielding electrons remain constant down a group

Tags

NGSS.HS-PS1-1

Which definition accurately describes the term "ion"

• atoms with the same number of protons but different numbers of neutrons

• an atom or group of atoms with a negative charge

• an atom or group of atoms that has a positive or negative charge

• an atom or group of atoms with a positive charge

Which definition accurately represents a cation?

• an atom that gains one or more electrons

• an atom that loses one or more electrons

• atoms that don't gain or lose electrons

Which definition accurately represents an anion?

• an atom that loses one or more elctrons

• an atom that gains one or more electrons

• an atom that doesn't gain or lose electrons

Which term has a net positive charge?

• cation

• anion

Which term has a net negative charge?

• cation

• anion

Which term is always smaller than the parent atom(s)?

• cation

• anion