Question

the monovalent anion of an element completely filled L shell .find the atomic number ,electronic configuration , electrons protons , neutrons if mass number is 19.
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Answer 1

Explanation:

monovalent anion means it carries -1 charge

k shell carries 2 electrons

l shell carries 8 electrons if it is completely filled after adding 1 electron

so atomic num is 10-1 =9

it is Flourine

1s2 2s2 2p6 electronic configuration

10 electrons

9 protons

19-9 =10 neutrons