About how many elements are known at present about how many, Ask an Expert

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About how many elements are known at present? About how many occur naturally in our environment?

Name the two elements that predominate in

(a) the Earth's crust,

(b) the Earth's core,

(d) the air. In each case,

list the more predominant element first.

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Category:- Physics
Reference No.:- M91994000

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