Question

an element has 19 electrons and find its group periodic number nature and valency​

Answer 1

$\huge\underline\mathfrak{Answer}$

Element is having 19 electrons i.e its atomic number is 19 and potassium is having 19 electrons and 1 in valence shell so it is having +1 as its valency ( electronic configuration - 2,8,8,1 ). It is from group 1.

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