The answer will depend on the elements which you have included in the 98% and the precision of those figures.
Nitrogen (78%) and Oxygen (21%) are the two main elements that make up approximately 99% of the Earth's atmosphere.
3% of earth's surface is covered by rainforest's.
No,but group 2 are alkaline earth elements
Group 2 elements in the periodic table are the alkaline earth metals.
2%
2
Trees
About 2%
Nikel and Iron. ;]
The elements of the second group are called the Alkaline Earth metals.
As of 2014, there are 17 known rare earth elements. In the early 1800s, only 2 were know.
It is 1.43 ms-2 compared to 9.81 ms-2 on earth.