Metals and non-metals: What am I?

I am a metal with the symbol K

I am used to make Jewellery and have the symbol Au

• Australianinium

• Gold

• Silver

• Metal

I am a non-metal with the symbol Kr

I am a non-metal which helps to make carbon dioxide, I have the symbol C

I am a metal needed for the development of bones and teeth, I have the symbol Ca

I am a non-metal gas with the symbol H, I help power the sun

I am a non-metal gas found in many balloons, I have the symbol He

I am a non-metal with the symbol Cl. Who am I?

I am a metal with the symbol Cu. Who am I?

I am the only metal in a liquid form. I have the symbol Hg, who am I?