If 100.0 molecules of H₂ and 43.0 molecules of O₂ react, how many molecules of H₂O can be produced in the reaction below? 2 H₂(g) + O₂(g) → 2 H₂O(g)

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.