The s-block

Match the following when X stands for cation:

• X₂O₂

• Sodium

• X₂O

• Potassium

• XO2

• Calcium

• XO

  (irregular)

• Lithium

• XO

  (irregular)

• Magnesium

Match the following :

• reaction with nitrogen

• Potassium

• most reactive

• Calcium

• may not react with water

• Lithium

• less effective storage rules

• Sodium

• yelllow flame

• Magnesium

Halite is the ​ (a)   form of ​ (b)   chloride.

• mineral
• sodium
• pure
• potassium
• lithium
• impure
• insoluble
• soluble

​ (a)   may dissolve in NaOH-solutions,

but there is ​​ (b)   reaction between the metal and NaOH.

• Sodium
• no
• Magnesium
• any
• some
• many

​ (a)   may dissolve in KOH-solutions,

but there is ​​ (b)   reaction between the metal and KOH.

• Potassium
• no
• Calcium
• any
• some
• many

When exposed to air, corrosion occurs

• Sodium

• Potassium

• Calcium

• Magnesium

Its cation can be given as: [Ne]

• Sodium

• Potassium

• Calcium

• Magnesium

Its cation can be given as: [Ar]

• Sodium

• Potassium

• Calcium

• Magnesium

The s-block metals or ​ (a)   metals do not occur in nature as ​ (b)   . Their ​ (c)   lattice is characterised by ​ (d)   hardness and ​ (e)   reactivity.

• base
• elements
• crystal
• low
• higher
• medium
• compounds
• FCC
• hexagonal
• BCC

The I.A or ​ (a)   metals are important for life: e.g. they can be found in our ​ (b)   . Their ​ (c)   lattice is characterised by ​​ (d)   1g/ml density and ​ ​ (e)   EN.

• alkali
• nervous system
• FCC
• below
• low
• high
• hexagonal
• BCC
• muscles
• above