Elements in atmosphere in pure form
Which group of elements is normally obtained from the atmosphere in pure form?
a) sulfur, phosphorus, oxygen, nitrogen
b) magnesium, sodium, calcium, strontium
c) flourine, chlorine, neon, argon
d) flourine, chlorine, oxygen, nitrogen
e) oxygen, nitrogen, neon, argon
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Which group of elements is normally obtained from the atmosphere in pure form?
a) sulfur, phosphorus, oxygen, nitrogen
b) magnesium, sodium, calcium, strontium ...
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