The world's lightest material is carbon aerogel which has a mass of only 0.16 milligram and it is even lighter than aerographite.
Carbonic acid.............................................
Hepta is seven and tetra is four, so option c is your answer
Answer:
1st Blank: <em>1 Co</em>
2nd Blank:<em> 2 Na2S</em>
3rd Blank:<em> 4 Na</em>
4th Blank:<em> 1 CoS2</em>
Explanation:
<em>Trust me</em>
