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Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost

shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.


dusha inmus . terenbe toba itka fudas hisfh in sg jbv kaste kalard wpnsb AED mude ahe a
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