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Two elements ‘A’ and ‘B’ have same number of electrons in their valence shells. The number of electrons present in the second last shell of atom ‘A’ is two

times the number of electrons present in the second shell of atom ‘B’. A and B respectively are
(1) Aluminium and phosphorus
(2) Magnesium and calcium
(3) Silicon and carbon
(4) Oxygen and sulphu


Sillicon and oxygen i think.it is write ans
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