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 configuration s of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.
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Q=2,8,3 ( Valency=+3 )
R=2,8,5 ( Valency=-3 )
When P and S combine they form: PS
∵P=2,8,1 ( Valency=+1 )
S=2,8,7 ( Valency=-1 )
Please mark it as brainliest.
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