Topic 6: The Periodic Table

Question 1

Group 18

Answer 1

noble or inert gasses
filled valance shells
usually don’t react w other substances

Question 2

Alkali metals, alkali earth metals, and halogens are in groups….. and are…

Answer 2

Alkali metals: group 1 (other than element 1)
Alkali earth metals: group 2
Halogens: group 17

-all highly reactive
-don’t exist as free elements in nature as they are found in compounds

Question 3

As you progress down a group, what happens to:
-atomic radius
-metallic character
-electronegativity
-1st ionization energy

Answer 3

electronegativity DECREASES
ionization energy DECREASES
and
atomic radius INCREASES
metallic character INCREASES

Question 4

As you progress across a period, what happens to:
-atomic radius
-metallic character
-electronegativity
-1st ionization energy

Answer 4

electronegativity INCREASES
ionization energy INCREASES
and
atomic radius DECREASES
metallic character DECREASES

Question 5

elements in a different form but in the same phase have…

Answer 5

1. different properties
2. different molecular or crystal structure