The maximum number of electrons which can hold by shell No. 1 should be determined. Concept Introduction: In a planetary model of an atom, negative charged electrons are arranged around the positive charged electron in a series of shells which is like orbits. The electrons present in the outermost energy level or shell is known as valence electrons. These electrons are available for bonding and outermost shell is known as valence shell.

Question

Which of the following atom(s) below has/have five valence electrons? A) C B) N C) O D) F E) All of the above

Answer 1

Question

Chapter 1, Problem 4CTQ

(a)

Interpretation Introduction

Interpretation:

The maximum number of electrons which can hold by shell No. 1 should be determined.

Concept Introduction:

In a planetary model of an atom, negative charged electrons are arranged around the positive charged electron in a series of shells which is like orbits.

The electrons present in the outermost energy level or shell is known as valence electrons. These electrons are available for bonding and outermost shell is known as valence shell.

(b)

Interpretation Introduction

Interpretation:

The maximum number of electrons which can hold by shell No. 2 should be determined.

Concept Introduction:

In a planetary model of an atom, negative charged electrons are arranged around the positive charged electron in a series of shells which is like orbits.

The electrons present in the outermost energy level or shell is known as valence electrons. These electrons are available for bonding and outermost shell is known as valence shell.

(c)

Interpretation Introduction

Interpretation:

The way should be described by which answers to a) and b) are contained in periodic table.

Concept Introduction:

The distribution of electrons in atom into orbitals is said to be electronic configuration. The electronic configuration for every element present in the periodic table is unique or different. Atomic number is equal to the number of protons, which is further equal to the number of electrons for neutral atom.

Periodic Table contains periods and groups. There are 18 groups and 7 periods in the periodic table. The vertical columns are known as groups and horizontal rows are known as periods. The numbering of periods is done as 1 to 7 from top to bottom and groups are named as 1A, 2A, 3B to 8B, 1B, 2B, 3A to 8A from left to right where A represents representative elements and B represents transition elements.

In periodic table, different blocks within the periodic table correspond to the s, p, d and f sublevels. Thus, on the basis of increasing atomic number in the periodic table, electronic configuration of atoms can be written.

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