Trends in the Periodic Table

What happens to the atomic numbers as you move from left to right across a period?

• Increase

• Decrease

• Stay the same

• Nothing

Two elements that have similar physical and chemical properties are most likely in the same...

• period

• row

• group

Which of these elements has an electron structure most similar to that of element X?

• 1
• 2
• 3
• 4

As you move down a group on the periodic table atoms get bigger.  This is because ____________.

• The atoms have more mass.
• The atoms have more protons.
• The atoms have more occupied electron shells

• The atoms have more neutrons

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

How many electrons are in the outer shell of all elements in Group I?

Select the elements that are in Group I

• Potassium

• Calcium

• Magnesium

• Lithium

• Sodium

The Group I elements are all very ____________.

• reactive

• unreactive

The reactivity of the Group I elements ______________ as they go down the group.

• decreases

• increases

• does not change

Halogens are the elements of group:

• I

• II

• VII

• VIII