Heredity or something like that I don’t speak English sorry
It would have 20 protons, 20 neutrons, and 20 electrons. Protons and electrons are USUALLY (I say usually because of the different types of atoms) the same as the atomic number. To find neutrons you take the atomic mass minus the atomic number. 40-20=20
Explanation:
Thyme, Thymus vulgaris, is a small, perennial, evergreen shrub in the family Lamiaceae grown primarily for its leaves which are used as a herb. The thyme plant has an erect or ascending growth habit and possesses many woody, branching stems. ... The leaves can be green or variegated.