Question

Write the electron configuration for Astatine (At), element 85 in its ground state. Indicate the number of valence and core electrons in this element How many unpaired electrons does ground state At possess? Which set of quantum numbers correctly describes an electron in the outermost orbital of a astatine atom? At Electron Configuration: Valence Electrons: Core Electrons: Quantum Numbers: n = 1 = m1 = m2 = Unpaired Electrons:

Answer 1

Astatine -

1) Electronic configuration :- 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁵

2) Valence electrons = 7

3) Core electrons = 78

4) Unpaired electrons = 1

5) Quantum numbers of the electron in the outermost orbital:-

n = 6 ; l = 1 ; m = -1,0,+1 ; s = +(1/2) or -(1/2)

Answer 2

Step1 1s2,2s2,2p6; 3s2,3p6,3d10; 4s2,4p6,4d10,4f14,5s2,5p6,5d10,7s2;7p5

Step2 Valence electron =7 ; Core electrons =78

Step3 Unpaired electron =1

Step4 n =7 ; l=1 ; m= -1,0,1 ; ms = 1/2 or -1/2

Answer 3

Electronic configuration : [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

Valence electrons 7

Core electrons = 78

Quantum numbers : n = 6 , l = 1 , m_l = 1 ,m_s = +1/2

Unpaired electrons: 1 unpaired electron