1) Electron construction of lithium: ₃Li: 1s² 2s¹, it has actually one valence electron in 2s orbital.

You are watching: Which of the following elements has the fewest valence electrons? beryllium boron carbon lithium

2) Electron construction of beryllium: ₄Be: 1s² 2s², it has actually two valence electrons in 2s orbital.

3) Electron construction of boron: ₅B: 1s² 2s² 2p¹, it has actually three valence electron in 2s and also 2p orbitals.

4) Electron construction of carbon: ₄C: 1s² 2s² 2p², the has 4 valence electrons in 2s and also 2p orbitals.

Explanation:

Valence electrons are the electrons present in the valence shell of an atom of an element.

Bismuth has actually atomic variety of 83.

=6s^26p^3" />

Number of valence electron = 5

Boron has atomic number of 5.

=2s^22p^1" />

Number the valence electron = 3

Barium has atomic variety of 56.

=6s^2" />

Number that valence electron = 2

Bromine has actually atomic number of 35.

=4s^24p^5" />

Number of valence electron = 7

Barium is just one of the element in the given choices which possesses fewest number of valence electrons

Bismuth has actually 5 valence electronsBoron has actually 3 valence electrons Barium has actually 2 valence electronsBromine has 7 valence electronsSo therefore, the correct answer would be Barium.

I think the correct answers are among the choices provided above are alternatives B and D. Boron and also lithium have actually the same number of valence electron which is one. Valence electrons room electrons the is maybe to take part in link formation.
I think your claim is correct.Because for Li, Be, B and also C, their valence electron room all located in the 2nd orbital, so based upon their sequence, Li must has fewest valence electrons.
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