Periodic trends

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

As you move down a group, atomic radius increases because - 

• you add more and more neutrons
• you add more and more protons
• you add more and more shells (energy levels)
• you add more atomic mass

The atom with the largest atomic radius in Period 4 (row 4) is - 

• K
• Kr
• Fe
• Fe

Francium (Fr) has the lowest ionization energy in Group 1 because - 

• it has the smallest number of valence electrons
• it has the greatest atomic mass
• it has the greatest number of protons, so it attracts its electrons the strongest
• its 1 valence electron is very far from the nucleus, so little energy is needed to remove it

Who is the halogen in period 2?

• F

• Br

• He

• At

Which of the following halogens has the greatest electronegativity?

• Chlorine (Cl)

• Bromine (Br)

• Iodine (I)

• Astatine (At)

Which group of elements has the lowest ionization energies?

• Alkali Metals (Group 1)

• Alkaline Earth Metals (Group 2)

• Halogens (Group 17)

• Noble Gases (Group 18)

Reactivity of metals.

• Decreases down a group

• Increases down a group

• Increases from left to right across a period

• Remains the same down a group

Which row describes the reactivity and the electronic structure of a noble gas?

• A

• B

• C

• D

As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons increasing the nuclear charge

• the atoms have less electrons decreasing the nuclear charge