Which of these pairs of aspects have the same variety of valence electrons? hydrogen (h) and helium (he) sodium (na) and potassium (k) carbon (c) and also oxygen (o) boron (b) and also beryllium (be)

alternative (b) is the correct answer.

You are watching: Elements that have the same number of valence electrons are

Explanation:

Valence electrons room the electrons which are current in outermost covering of one atom.

So, number of valence electrons of given facets will be together follows.

Phosphorous (P) - atom number is 15, valence electrons space 5.

Chlorine (Cl) - atomic number is 17, valence electrons room 7.

Beryllium(Be) - atomic number is 4, valence electrons are 2.

Calcium (Ca) - atomic number is 20, valence electrons room 2.

Helium (He) - atomic number is 2, valence electrons are 0.

Oxygen (O) - atom number is 16, valence electrons space 6.

Carbon (C) - atomic number is 6, valence electrons are 4.

Therefore, we deserve to conclude the berylium (Be) and also calcium (Ca) is the pair of elements that have the same number of valence electrons.

Answer : The correct option is, (B) sodium and potassium

Explanation :

Valence electrons : Valence electrons space those electrons which are present in the outermost shell of the element.

As we know that,

Option (A) :

Element = Hydrogen

Atomic number = number of electrons = 1

The digital configuration is,

The variety of valence electrons = 1

Element = Helium

Atomic number = variety of electrons = 2

The digital configuration is,

The variety of valence electrons = 2

Option (B) :

Element = Sodium

Atomic number = number of electrons = 11

The electronic configuration is,

The number of valence electrons = 1

Element = Potassium

Atomic number = number of electrons = 19

The digital configuration is,

The variety of valence electron = 1

Option (C) :

Element = Carbon

Atomic number = variety of electrons = 6

The digital configuration is,

The number of valence electron = 4

Element = Oxygen

Atomic number = number of electrons = 8

The electronic configuration is,

The number of valence electrons = 6

Option (D) :

Element = Boron

Atomic number = number of electrons = 5

The electronic configuration is,

The variety of valence electrons = 3

Element = Beryllium

Atomic number = variety of electrons = 4

The digital configuration is,

The variety of valence electrons = 2

From this us conclude that, the sodium and potassium are the aspects have the same number of valence electrons.

Hence, the correct choice is, (B)

Explanation:

Both carbon and lead belonging to team 4 elements, and they have actually the same number of valence electrons.

IT IS B

Explanation:

Berylium(Be) and also calcium(Ca)
Both carbon and lead belong to team IV elements, and thus they have actually the same number of valence electrons. In every of the various other options, the two elements belong to different groups, and thus they carry out NOT have the same variety of valence electrons.
Carbon (C) and also lead (Pb) 4e⁻

C 2s²2p²

Pb 6s²4f¹⁴5d¹⁰6p²

The answer to that is b
The same number of valence electrons exists in the same household of facets in the periodic table. In finding the answer come this problem, we just have actually to discover the pair the belongs come the same family members in the periodic table. The same family way same column. Amongst these, Oxygen and lead (Pb) are in the exact same family. This pair is the answer.

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