Labels:text | screenshot | font | number | menu | black and white OCR: Atomic number 1 Atomic weight 1.00797 Valency + 1, - 1 Electronegativity 2.2 Color colorless gas Melting point -259.14º C Boiling point -252.87º C Density 0.08988 g/cu cm at Oº Cand 1 atmosphere Heat of vapori zation 0.21 6 kcal /mole Heat of fusion 0.028 kcal/mole Dissociation energy of H(2) 104.2 kcal/mole First ionization potential (25 ℃) 13.597 ev E *: H+ (aq) + e- Æ 1/2H(2)(g) -0.414 ৳ Atomic volume 13.21 cu cm/mole Atomic radius 1.2 angstroms Interatomic distance 0.74 angstroms Nonpolar covalent radius 0.37 angstroms Crystal structure solid-hexagonal Critical temperature -239.9 deg C Critical pressure 13.0 atmospheres Critical density 0.0301 g/cu cm
