Here's how to determine the number of hydrogen atoms in heptene:

* Heptene is a type of alkene, meaning it has a carbon chain with a double bond.

* "Hep" in the name tells us the carbon chain has seven carbons.

General Formula for Alkenes: C_nH_2n

Applying the Formula:

* n = 7 (number of carbons)

* H_2n = H₂₍₇₎ = H₁₄

Therefore, heptene has 14 hydrogen atoms.