Periodic Trends

Atomic radius INCREASES when you go ________ a group

Atomic radius DECREASES when

• when you go across a row from right to left

• when you go down a group

• when you go across a row from left to right

• when you go across a group from left to right

Put in order from biggest to smallest (decreasing size)

• Krypton

• Zinc

• Calcium

• Iron

• Bromine

Ionization energy ________________ as you go DOWN a group

• increases

• decreases

Which atom has larger ionization energy

• aluminum

• sulfur

Which atom has smaller ionization energy

• strontium

• iodine

What element is the most electronegative

• chlorine

• bromine

• iodine

• astatine

What element is the LEAST electronegative

• cadmium (Cd)

• antimony (Sb)

• Zirconium (Zr)

• Strontium (Sr)

What metal is most reactive

• lithium

• sodium

• potassium

• rubidium

Which element has the greater ionization energy?

• Magnesium
• Phosphorus