Question

in electrochemical series is Sodium more reactive than calcium

Answer 1

Sodium displaces calcium from an ionic compound and hence it is more reactive. Calcium cannot displace sodium from its compound because it is less reactive. Na is more reactive ( Kinetics) than Ca. Whereas thermodynamically , Ca ( more Standard Oxidation Potential)has more tendency to react till equilibrium.
Hope its help u

Answer 2

yes,
potassium
sodium
calcium
magnisium
aluminium
zinc
iron
lead
copper
silver
gold
platinum