The atomic number of three elements are given below: Element and atomic number respectively A 3, B 6 and C9. Write the symbol of the element which belongs to (a) Group 1 and (b) Group 14 of the periodic table. State the period of the periodic table to which these elements belong. State reasons to support your answer. No inappropriate answers or irrelevant answers. Anything wrong will be reported. Answer properly. It is for 20 points.
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The average of atomic masses of hydrogen and nitrogen is 7.5 whereas the atomic mass of oxygen is 15. Therefore, the law of triads is not applicable in this group.
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