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sin theta equals to cos theta then the value of sin 2 theta
it's Lithium or Li
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13 An Ionic Bond
these are the characteristics of an ionic bond compounds like NaCl have these characteristics
14 substances could be compounds or elements hence not all substances are compounds
15 It is not water. The chemical composition of water is H2O not H202
(H202 is hydrogen peroxide and is toxic)
Answer:
I have the same thing it's hard