Chemistry -(Hydrogen)
nvB‡Wªv‡Rb ( ) ivmvqwbK ms‡KZ: H Avwe¯‹viK:ievU e‡qj Atomic number (number of protons in the nucleus): 1 Atomic symbol (on the Periodic Table of Elements): H Atomic weight (average mass of the atom): 1.00794 Density: 0.00008988 grams per cubic centimeter Phase at room temperature: Gas Melting point: minus 434.7 degrees Fahrenheit (minus 259.34 degrees Celsius) Boiling point: minus 423.2 F (minus 252.87 C) Number of isotopes (atoms of the same element with a different number of neutrons): 3 ...