Physical Properties

Question 1

at 25 Celsius all s block elements are solid
at 30 Celsius Cs and Fr are liquid

Question 2

Hydration energy,Hydration and Hydrated Radius order in
i)Alkali Metals
ii)Alkaline Earth Metals and Be

Answer 2

i)Li+>Na+>K+>Rb+>Cs+
ii)Be+2>Mg+2>Ca+2>Sr+2>Ba+2

Question 3

Melting Point order in
i)Alkali Metals
ii)Alkaline Earth Metals + Be

Answer 3

i)Li>Na>K>Rb>Cs(Size increases,metal bond strength decreases)
ii)Be>Mg<Ca>Sr>Ba
Be>Ca>Sr>Ba>Mg(solid state structure)</Ca>

Question 4

Density order in
i)Alkali Metals
ii)Alkaline Earth Metals and Be

Answer 4

i)Li<Na>K<Rb<Cs
Li<K<Na<Rb<Cs
ii)Be>Mg>Ca<Sr<Ra
Ca<Mg<Be<Sr<Ra</Na>

Question 5

i)Which Elements show photoelectric effect
ii)Which elements are used in photochemical cell

Answer 5

i)K,Rb,Cs
ii)K,Cs