元素

Free

1.2for iPhone, iPad

Ip Hiu Lam

Developer

Dec 19, 2018

Update Date

Reference

Category

App Store

Age Rating

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12+

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17+

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Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

元素 Screenshots

iPad

iPhone

About 元素

【元素】語音版
化學元素指自然界中的一百多種基本的金屬和非金屬物質。同一種化學元素是由相同的原子組成，也就是其原子中的每一核子具有同樣數量的質子，用一般的化學方法不能使之分解，並且能構成一切物質。原子序數大於82的元素（即鉛之後的元素）沒有穩定的同位素，會進行放射衰變。第43和第61種元素（即鎝和鉕）亦沒有穩定的同位素，會進行衰變。即使是原子序數大於82，沒有穩定原子核的元素，有些仍可能存在在自然界中，如鉍、釷、鈾、鈽等天然放射性核素。其餘原子序數小於99的放射性元素在自然界中亦有少量或痕量存在。所有化學物質都包含元素，即任何物質都包含元素，隨著人工的核反應，會發現更多的新元素。2018年，總共有118種元素被發現，其中地球上有98種。