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19Identify the element X and its symbol.Write down its atomic number and mass numWrite down its Electronic configuration and vind No of protons and neutrons. |
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AnswerΒ» Hi dear... Please post clearly... There r something missing in your quotation The element is potassium,and it's symbol is K,It's atomic number is 19 and mass number is 39,Its electronic configuration is-1s2,2s2,2p6,3s2,3p6,4s1. And its valance e is only one, that is 4s1. No of protons is 19 and no of e is also 19 but no of neutron is 20.πππ |
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