Answer:
— Descriptions, Uses and Occurrences
H. Hydrogen. explosive gas, lightest element. ...
He. Helium. inert gas, second-lightest element. ...
Li. Lithium. lightest metal, soft, reactive. ...
Be. Beryllium. lightweight metal. ...
B. Boron. hard black solid. ...
C. Carbon. hard diamond, soft graphite. ...
N. Nitrogen. ...
O. Oxygen.