brionna246
05.10.2020 •
Chemistry
If an element has the atomic mass (A) of 80 and its atomic number (Z) is 35, how many neutrons does it have?
42
35
45
79
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Ответ:
Soil is our life support system. Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites.