Предмет: Химия, автор: Аноним

Кількість протонів, електронів, нейтронів в кальцію.

Ответы

Автор ответа: Nastena12012

114

Протонів - 20 (Кількість протонів=кількості електронів)
Електронів - 20
Нейтронів = Атомна маса - кількість протонів (40-20 = 20)

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Предмет: Английский язык, автор: valentinap0410

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global, modern, chemical, man-made, various, liquid, different, available, certain, tremendous, greatest, material warming, temperature, advantages, shades, colours, resins, plastics, state, substance, chemistry, characteristics

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What are the greatest advantages plastics may give the world?
THE WONDERLAND OF PIASTICS
1. Plastics or «synthetic resins» as they are sometimes called, are entirely the product of modern chemistry and are like no other substances found on the earth or in the sea. The discovery of plastics has at last opened the road which will lead man to victory over nature and make him independent of nature's products.
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