Which element has two valence electrons? A) calcium

B) lithium

C) chlorine

D) neon

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils