谁能帮我做这两道英语科学题?.
1.explain the layout of the periodic table.includ these words:groups,periods,atomic number,metals non-metals,metalloids and noble gases.
2.plutonium has an atomic number of 94.explain why there are no naturally occurring deposits of plutonium on earth.
人气：459 ℃ 时间：2019-08-27 14:51:48
解答
1 :the periodic table are seperated into periods,there are 4 groups metals,non-metals,metalloids and noble gases.each group's elements all have atomic number which is the number of protons found in th...
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