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प्रश्न
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
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उत्तर
6.022 × 1023 atoms are present in 12g of carbon-12 element.
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(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
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