No Obligation, and เลนต์ (English:Covalent bond) is no obligation chemical molecules within the obligation, one of two atoms atom เลนต์ caused by use of one or more pairs วเลนซ์ electron sharing cause gravity as well as the atom is a molecular.Therefore, atoms that create obligations, and therefore there is always เลนต์ วเลนซ์ electron, and is very much like iron deficiency among VI VII etc. No Obligation, and among his เลนต์ stronger than hydrogen and has a strong commitment to the strength as well as the ion electronic obligation
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