Calcium au 2. iron ca 3. nickel fe 4. copper cu 5. gold ni

matching element is as below

calcium - ca

iron - Fe

nickel=Ni

copper-Cu

gold - Au

explanation

symbols is a code for a chemical element. some element are given symbols from their first two letters for example calcium symbol Ca is from first two letters. some symbols are from latin words example symbol Au for gold is from a latin word Aurum

matching element is as below

calcium - ca

iron - Fe

nickel=Ni

copper-Cu

gold - Au

explanation

symbols is a code for a chemical element. some element are given symbols from their first two letters for example calcium symbol Ca is from first two letters. some symbols are from latin words example symbol Au for gold is from a latin word Aurum