A scientist finds a bone that has about 15% Element 1 left. About how old is the bone?

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?