3.2 Periodic Trends - Atomic Radius

The more protons there are, the __________.

• Stronger the pull.

• Weaker the pull.

• No effect on the pull.

• Less attraction.

Atomic radius generally increases as we move __________.

• down a group and from right to left across a period.

• up a group and from left to right across a period.

• down a group and from left to right across a period.

• up a group and from right to left across a period.

What is the effect of electron shielding on atomic radius?

• Electron shielding increases the effective nuclear charge felt by outer electrons, decreasing atomic radius.

• Electron shielding has no effect on atomic radius.

• Electron shielding reduces the effective nuclear charge felt by outer electrons, increasing atomic radius.

• Electron shielding only affects the inner electrons, not the outer electrons.

What is the relationship between atomic radius and reactivity in metals?

• Generally, larger atomic radius correlates with higher reactivity in metals.

• Smaller atomic radius correlates with higher reactivity in metals.

• Atomic radius has no effect on the reactivity of metals.

• Reactivity in metals is inversely proportional to atomic radius.

How does atomic radius change down a group?

• Atomic radius decreases down a group.

• Atomic radius remains constant down a group.

• Atomic radius increases down a group.

• Atomic radius fluctuates down a group.

Which atom has the largest radius?

• Ca.

• Na.

• Mg.

• Al.

Order the following in increasing atomic radii: Ra, Be, Ca, Rb, H.

• H, Be, Ca, Rb, Ra

• Be, H, Ca, Ra, Rb

• H, Ca, Be, Rb, Ra

• Rb, Ra, Ca, Be, H

What is atomic radius?

• The distance from the nucleus of an atom to the outermost shell of electrons.

• The size of an atom's nucleus only.

• The total number of electrons in an atom.

• The distance between two atoms in a molecule.

What is the relationship between atomic radius and reactivity in nonmetals?

• Generally, smaller atomic radius correlates with higher reactivity in nonmetals.

• Larger atomic radius correlates with higher reactivity in nonmetals.

• Atomic radius has no effect on the reactivity of nonmetals.

• Reactivity in nonmetals is inversely proportional to atomic radius.

Which has a larger radius: Na or Na⁺?

• Na has a larger radius than Na⁺.

• Na⁺ has a larger radius than Na.

• Both have the same radius.

• Na has a smaller radius than Na⁺.