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

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

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

answer; i believe the correct answer is (c) /// is a homogeneous mixture of gaseous substance nitrogen,oxygen and smaller amounts of other substancesmixtures can be either ( homogeneous or heterogeneous)plz check first good luck