What is the odd one out and why?

k- potassium
na - sodium
li- lithium
ca - calcium
mg- magnesium
al- aluminium
c- carbon
zn - zinc
fe - iron
pb - lead
cu- copper
ag -silver
au-gold

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.