Give the electron configuration for an element with 19 electrons. How many valence electrons does this element have?

Expert Solution

answer : onyl one valency electron it has

explanation :

element with 19 electrons means its atomic number 19. so it is potassium .

electronic configuration of potassium = 1s²2s²2p⁶3s²3p⁶4s¹

in the outer most shell of potsiium contain one electron . so it is considered as valency electron.

so this element is placed in first group . all first group elements valency =1 (that is s¹)

queen_honey_blossom answered 1 year ago

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