In an ionic bond, one atom essentially donates an electron to stabilize the other atom. The atoms in an ionic bond have different electronegativity values from each other.
While in a covalent bond, the atoms are bound by shared electrons and the electronegativity values are the same.
The shape of BeH2 is linear.
<span>Chemical and physical actions of groundwater form </span>Karst topography.
H2 has the lowest boiling point.