S3 Chemistry - Atoms

在常温常壓下，所有金屬都是固體。At room temperature and pressure, all metals are solids.

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硅是類金屬。Silicon is a metalloid

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鎂的符號是Ma。The symbol of magnesium is Ma.

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元素的原子序相等於該元素的原子內的電子數目。The atomic number of an element equals the number of electrons in an atom of that element.

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元素的原子必定具有相同數目的質子和中子。An atom of an element must contain equal number of protons and neutrons.

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所有原子均具有中子。All atoms contain neutrons.

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氟原子具有9個電子。A fluorine atom contains 9 electrons.

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氧的原子序是8。The atomic number of oxygen is 8

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在原子內，第二層電子層最多可容納10個電子。In an atom, the second electron shell can hold a maximum of 10 electrons.

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