Àkójọ átọ̀mù

Ká mọ́ ṣe àṣìṣe rẹ̀ mọ́ Ìwúwo átọ̀mù tàbí Nọ́mbà àkójọ átọ̀mù.

Àkójọ átọ̀mù (atomic mass) (m_a) ni akojo of a specific isotopu pato kan, to saba je kiko ni eyo akojo atomu. Akojo atomu ni apapo akojo awon protoni, neutroni ati elektroni ninu atomu kan soso.

Stylized lithium-7 atom: 3 protons, 4 neutrons & 3 electrons (total electrons are ~1/4300th of the mass of the nucleus). It has a mass of 7.016 u. Rare lithium-6 (mass of 6.015 u) has only 3 neutrons, reducing the atomic weight (average) of lithium to 6.941 u.