Question

when do we use penta instead of pent and hepta in place of hept​

Answer 1

Answer:

These are conventions set by IUPAC ..

Answer 2

the difference between Latin and Greek. Four, five and six do have their own forms.

Latin: bi-, tri-, quad-, quin-, sex-, sept-...

Greek: di-, tri-, tetra-, pent-, hex-, hept-...

Generally, Latin prefixes are added to Latin roots and Greek prefixes to Greek roots.

Quadrilateral, quintuplet, September etc.;

Tetrahedron, heptagon etc.

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