Which of the following atoms has seven valence electrons? a) chlorine (Cl) b) nitrogen (N) c)...


Which of the following atoms has seven valence electrons?

a) chlorine (Cl)

b) nitrogen (N)

c) manganese (Mn)

d) oxygen (O)

Valence Electron:

In the periodic table, each element has a different atomic number which is equal to the number of protons present in the nucleus. For a neutral atom, the number of electrons is equal to the number of protons. Therefore, it can be concluded that the atomic number is equal to electrons present in the atom. These electrons revolve in orbits around the nucleus. The outermost shell of the atom is known as the valence shell and the electrons present are known as the valence electrons. To determine the number of electrons present in the valence shell, the electronic configuration of the atom is to be determined. The electronic configuration of an atom can be determined with the help of the Aufbau principle. According to the Aufbau principle, the orbitals with the lower entry will be filled first, and only then the orbitals with the higher energy will be filled.

Answer and Explanation: 1

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(a) Chlorine({eq}\rm Cl {/eq})

The atomic number of chlorine is {eq}17. {/eq}

Writing the electronic configurations:

{eq}\rm Cl = 1s^2, 2s^2,...

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What Are Valence Electrons? - Lesson for Kids


Chapter 1 / Lesson 4

Discover a special group of electrons called valence electrons. Explore how electrons are arranged around the nucleus of an atom, where the valance electrons are located, and how to predict the number of valence electrons for an element.

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