Respuesta :

pstnonsonjoku

Answer:

Arsenic (As)

Explanation:

The electron configuration of arsenic is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 or [Ar]4s2 3d10 4p3 for short.

Arsenic is a group 15 element. All group 15 elements have outermost electron configuration of ns^2 np^3. Arsenic is the only member of the group that possesses exactly three electrons in the 4p orbital.

Hence As is the element we need to identity in the question.

tutorAnne

Answer: Arsenic

Explanation: The element that contains exactly three 4p  electrons at ground state is  

Arsenic, a group 15 and period 4 solid (20°C) element with  

atomic weight 74.9216g/mol  whose Electronic configuration  is

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p³ with the  condensed electronic configuration as  [Ar] 3d¹⁰ 4s² 4p³.