Acold cast iron skillet is placed onto a stove top when the stove is turned on the skillet becomes very hot why does the skillet become hot.

The skillet becomes hot because of conduction. Conduction is the transfer of energy through matter from particle to particle. It is the transfer and distribution of heat energy from atom to atom within a substance. 
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How many calories in food

Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).