The number of valence electrons in each of the given elementsis to be determined. Concept Introduction: As per Bohr’s model of an atom, electrons are arranged in orbits. Orbits are circular paths in which electrons revolve around the nucleus. There can be a maximum of two electrons in the first orbit, eight electrons each in the second and third orbits and eighteen electrons in the fourth orbit. The arrangement of electrons in an orbit is termed as electronic configuration. The atoms in which the orbits are completely filled are the least chemically reactive while those in which the orbits are incomplete are reactive. The electrons present in the last orbit of the electronic configuration of an atom are called valence electrons. If two elements have the same number of valence electrons, they will have similar properties.

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Chapter 3, Problem 29E

Interpretation Introduction

Interpretation:

The number of valence electrons in each of the given elementsis to be determined.

Concept Introduction:

As per Bohr’s model of an atom, electrons are arranged in orbits. Orbits are circular paths in which electrons revolve around the nucleus. There can be a maximum of two electrons in the first orbit, eight electrons each in the second and third orbits and eighteen electrons in the fourth orbit.

The arrangement of electrons in an orbit is termed as electronic configuration. The atoms in which the orbits are completely filled are the least chemically reactive while those in which the orbits are incomplete are reactive.

The electrons present in the last orbit of the electronic configuration of an atom are called valence electrons. If two elements have the same number of valence electrons, they will have similar properties.

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