谁能帮我做这两道英语科学题?.
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.
问答/186℃/2024-08-20 10:14:16
优质解答：
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 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.