What shape forms when two H 1s orbitals overlap?

The overlapping hydrogen one s orbitals form a bonding molecular orbital that looks like an elongated, egg shaped region of electron density between the two nuclei.

Think of each hydrogen atom as carrying a tiny round cloud where its single electron usually resides, and when two hydrogens get close enough those two round clouds merge in the space between the nuclei to form one bigger cloud; that merged cloud is the bonding orbital and it is thicker between the atoms where the electrons are most likely to be found. This combined cloud is not hollow or ring shaped but rather smooth and bulging along the axis that connects the two nuclei, so it resembles an egg or rugby ball stretched between them. The increased electron density in that middle region holds the two positively charged nuclei together because opposite charges attract, and that is why a single hydrogen-hydrogen bond forms. If the atoms were farther apart their individual clouds would barely touch and the bond would be weak or absent.

A common mistake is picturing electrons as tiny balls orbiting like planets instead of a fuzzy cloud; remember the shape describes where the electron is likely to be, not a fixed path, and picturing a smooth, elongated cloud helps avoid that error. Another misconception is thinking the shape is two separate spheres stuck together instead of one continuous bulging region; imagining the merged cloud as one egg shaped volume centered between the nuclei fixes that mental image. Some students assume the shape is the same for every bond, but the egg like shape specifically describes one s orbital overlaps while other orbital overlaps give different shapes, so always note which orbitals are involved.

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Hydrogen 1s Orbital Overlap Shape

1. Each hydrogen has a round electron cloud
2. Clouds merge between close atoms
3. Merged cloud forms bonding orbital
4. Cloud bulges along nuclei axis
5. Increased density holds nuclei together

Common Mistakes in Orbital Shape Understanding

1. Thinking electrons orbit like planets
2. Seeing two spheres instead of one
3. Assuming same shape for every bond

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