Question

Using Aufbau principle, write the ground state electronic configuration of following atoms: (i) Boron (Z = 5) (ii) Neon (Z = 10) (iii) Aluminium (Z = 13) (iv) Chlorine (Z = 17) (v) Calcium (Z = 20) (vi) Rubidium (Z=37)

Answer 1

Aufbau principle:

Electrons are added one at a time from the lowest energy orbitals available until all the orbitals are filled.

According to the Aufbau principle, electrons fill lower energy orbitals first.

(i) Boron (Z = 5)

Electronic configuration = ${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 1 }$

(ii) Neon (Z = 10)  

Electronic configuration = ${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 2 }{ 2p }_{ y }^{ 2 }{ 2p }_{ z }^{ 2 }$

(iii) Aluminium (Z = 13)  

Electronic configuration = ${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 2 }{ 2p }_{ y }^{ 2 }{ 2p }_{ z }^{ 2 }{ 3s }^{ 1 }$

(iv) Chlorine (Z = 17)

Electronic configuration = ${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 6 }{ 3s }^{ 2 }{ 3p }_{ x }^{ 2 }{ 3p }_{ y }^{ 2 }{ 3p }_{ z }^{ 1 }$

(v) Calcium (Z = 20)  

Electronic configuration =${ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 6 }{ 3s }^{ 2 }{ 3p }^{ 6 }{ 4s }^{ 2 }$

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Answer 2

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Hiii here is your answer......

Aufbau principle:

Electrons are added one at a time from the lowest energy orbitals available until all the orbitals are filled.

According to the Aufbau principle, electrons fill lower energy orbitals first.

(i) Boron (Z = 5)

Electronic configuration = 1s22s22px1{ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 1 }1s

2

2s

2

2p

x

1

(ii) Neon (Z = 10)

Electronic configuration = 1s22s22px22py22pz2{ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 2 }{ 2p }_{ y }^{ 2 }{ 2p }_{ z }^{ 2 }1s

2

2s

2

2p

x

2

2p

y

2

2p

z

2

(iii) Aluminium (Z = 13)

Electronic configuration = 1s22s22px22py22pz23s1{ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }_{ x }^{ 2 }{ 2p }_{ y }^{ 2 }{ 2p }_{ z }^{ 2 }{ 3s }^{ 1 }1s

2

2s

2

2p

x

2

2p

y

2

2p

z

2

3s

1

(iv) Chlorine (Z = 17)

Electronic configuration = 1s22s22p63s23px23py23pz1{ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 6 }{ 3s }^{ 2 }{ 3p }_{ x }^{ 2 }{ 3p }_{ y }^{ 2 }{ 3p }_{ z }^{ 1 }1s

2

2s

2

2p

6

3s

2

3p

x

2

3p

y

2

3p

z

1

(v) Calcium (Z = 20)

Electronic configuration =1s22s22p63s23p64s2{ 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 6 }{ 3s }^{ 2 }{ 3p }^{ 6 }{ 4s }^{ 2 }1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

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