atom, the smallest building unit of matter, electron, negative charge, sodium, Na, nucleons, mass number, proton, atomic number, potassium, K, carbon, C, neutron, neutral, mass number, sum of protons and neutrons, atomic number, number of protons, isotopes, different forms of the same element, protium, has no neutrons

Atomic structure

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?