Buddha Abhidhamma - Ultimate Science - BuddhaNet

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It should be noted that kalàpas are so small that they are
invisible even under electronic microscopes. The size of kalàpa
in the human realm is just a 10 –5 th of a paramànu, which is smaller
than an atom. So kalàpas are comparable to electrons, protons
and neutrons in size.
There are 21 types of kalàpas—9 kammaja kalàpas + 6 cittaja
kalàpas + 4 utuja kalàpas + 2 àhàraja kalàpas.
1 Nine Kammaja-kalàpas
These are formed from the 18 kammaja-råpas. In all kalàpas, the 8
avinibbhoga-råpas form the nucleus. All kammaja-råpas contain
jãvita-råpa which is the physical life. So a group of 8 avinibbhogaråpas
and jãvita-råpa forms the simplest unit of kammaja-råpa. It
is called jãvita-navaka-kalàpa meaning ‘group of 9 råpas including
jãvita’. It may be shortened to ‘jãvita-nonad’.
By adding the remaining 8 kammaja-ekaja-råpas one at a time
to this basic unit of ‘jãvita-nonad’ we get the remaining 8 kammajakalàpas.
1 Cakkhu-dasaka (eye-decad)
8 avinibbhoga-råpas + jãvitaråpa + cakkhu-pasàda
2 Sota-dasaka (ear-decad)
8 avinibbhoga-råpas + jãvita-råpa + sota-pasàda
3 Ghàna-dasaka (nose-decad)
8 avinibbhoga-råpas + jãvitaråpa + ghàna-pasàda
4 Jivhà-dasaka (tongue-decad)
8 avinibbhoga-råpas + jãvita-råpa + jivhà-pasàda
5 Kàya-dasaka (body-decad)
8 avinibbhoga-råpas + jãvita-råpa + kàya-pasàda
6 Itthibhàva-dasaka (female-decad)
8 avinibbhoga-råpas + jãvita-råpa + itthibhàva-råpa