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TOEFL BNC: 4241 COCA: 5184

B2 the smallest unit of any chemical element, consisting of a positive nucleus surrounded by negative electrons. Atoms can combine to form a molecule原子

A molecule of carbon dioxide (CO2) has one carbon atom and two oxygen atoms.二氧化碳(CO2)分子是由一个碳原子和两个氧原子构成的。
figurative He hasn't an atom of sense (= he has no sense), that boy.那个孩子啊,一点头脑也没有。

More examples

The nucleus of a deuterium atom contains a proton and a neutron.

Scientists are working to harness the power of the atom.

TOEFL BNC: 4241 COCA: 5184
atom

noun

ADJECTIVE | VERB + ATOM | ATOM + NOUN ADJECTIVEcharged, unstable帶電/不穩定的原子positively charged atoms帶正電的原子carbon, nitrogen, etc.碳原子、氮原子等VERB + ATOMsplit分裂原子the first person to split the atom第一個分裂原子的人ATOM + NOUNbomb原子彈
TOEFL BNC: 4241 COCA: 5184
TOEFL BNC: 4241 COCA: 5184
atom
Atoms and parts of atoms: alpha particle, anion, antiparticle...
Small amounts or pieces of something: bit, piece, fragment...

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