Which statement about the Periodic Table is correct?
Elements in the same group have the same number of electron shells.
It contains elements arranged in order of increasing proton number.
Metals are on the right and non-metals are on the left.
The most reactive elements are at the bottom of every group.
B
Lithium and potassium are metals in Group I of the Periodic Table.
Lithium has a melting point of 181∘C and a density of 0.53 g/cm3.
Which row describes the melting point and density of potassium?
melting point in ∘C
density in g/cm3
less than 181
less than 0.53
less than 181
greater than 0.53
greater than 181
less than 0.53
greater than 181
greater than 0.53
B
Which row describes the structure of Group VII elements and the trend in their reactivity down the group?
structure
reactivity down
Group VII
diatomic
increases
diatomic
decreases
monatomic
increases
monatomic
decreases
B
Which statements describe the elements in Group VIII of the Periodic Table?
1 Their atoms have full outer electron shells.
2 They are unreactive metals.
3 They are monatomic gases.
4 They are diatomic gases.
1 and 3
1 and 4
2 and 3
2 and 4
A