Walxaha kiimikadu waxay ka kooban yihiin atamka iyo molecules. Atomyadu waa qaybaha ugu yar ee curiyaha leh sifooyinka kiimikaad ee curiyahaas. Molecules waxay ka kooban yihiin laba atam ama in ka badan. Molecules waa unugyada dhiska walxaha kiimikada.

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