谁能帮我做这两道英语科学题?.
1.explainthelayoutoftheperiodictable.includthesewords:groups,periods,atomicnumber,metalsnon-metals,metalloidsandnoblegases.
2.plutoniumhasanatomicnumberof94.explainwhytherearenonaturallyoccurringdepositsofplutoniumonearth.