3. In Density with regards to 4th and 7th period it ____from right to the middle.
a. decreases
c. the same
b. increases
d, either A or B
4. Which Family of elements, react with oxygen to form basic solution when
dissolved in water?
I. Group 1 II. Group 2
III. Group 13 IV. Group 14

a. Group 13 and Group 14
c. Group 14 and Group 1
b. Group 13 and Group 2
d. Group 1 and 2

5. What element can be added to oxygen to make it basic?
a. Iron
c. Silicon
b. Copper
d. Magnesium​