作业帮谁能帮我做这两道英语科学题?.
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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.
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.
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 the nucleus of an atom.
2:Plutonium is not formed by the death of a star in a super nova like uranium is.Uranium is the heaviest element formed in that event.That's why there isn't any plutonium around as an ore.Just the trace amounts found with uranium.
2:Plutonium is not formed by the death of a star in a super nova like uranium is.Uranium is the heaviest element formed in that event.That's why there isn't any plutonium around as an ore.Just the trace amounts found with uranium.