Question

How many elements are present in Si and SiO₂

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Answer 1

Explanation:

In Si there is only one element which is Silicon.

In SiO2 there are two elements which are Silicon and Oxygen

Answer 2

Answer:

$si \: = \: silica \: and \: \\ sio2 \: = \: sillicon \: atom \: and \: two \: \\ more \: oxygen \: atom \:$

Explanation:

silicon have 90°/• of the earth crust