the smallest whole piece of matter - atom, a group of atoms bonded together of the same type - element, anything that has mass and takes up space (volume) - matter, a group of atoms held together by a chemical bond - molecule, solid, liquid, gas,

matter / atoms / molecules / elements

由
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?