Periodic Trends Atomic Radius

Place the following types of orbitals in order from smallest to largest:

smallest ​ ​ (a)   ​ (b)   ​ (c)   ​ (d)   largest

• s
• p
• d
• f

Place the types of orbitals in order from smallest to largest:

smallest ​ (a)   ​ (b)   ​ (c)   ​ (d)   largest

• s
• p
• d
• f

Make a prediction:

The atomic radius of Lithium is larger or smaller than the atomic radius of Sodium.

The atomic radius increases as you move down each group on the periodic table, how do you think the atomic radius will change as you move across a period?

• As you move across a period the atomic radius will stay the same because the number of energy levels stays the same

• As you move across a period, the atomic radius will increase because the number of protons increases

• As you move across a period the atomic radius will decrease because the effective nuclear charge increases

• As you move across a period there is no consistent trend in atomic radius

Electron shielding occurs when the inner shell electrons do what to the outer shell electrons?

The atomic radius is a periodic trend that ​ (a)   as you move down a group and ​ (b)   as you move left to right across a period on the periodic table.

• increases
• decreases