Chapter 4, Problem 4.56UTC

Interpretation Introduction

Interpretation:

The missing number of sub-atomic particles occurring in isotopes of silicon.

Concept Introduction: Atomic number: Number of protons present in the atom is known as atomic number of atom.

$\text{Atomic}\text{number}\text{=}\text{Number}\text{of}\text{protons}$

Mass number: The number of protons and neutrons present inside the nucleus of atom are known as mass number.

$\text{Mass}\text{number}\text{=}\text{Number}\text{of}\text{protons}\text{+}\text{Number}\text{of}\text{neutrons}$

Number of protons: The atomic number of an atom denotes the number of protons.

$\text{Number}\text{of}\text{protons}\text{=}\text{Atomic}\text{number}$

Number of neutrons: We get number of neutrons from mass number after subtracting number of protons from mass number because mass number is sum of number of protons and neutrons.

$\text{Number}\text{of}\text{neutrons}\text{=}\text{Mass}\text{number}\text{-}\text{Number}\text{of}\text{protons}$

Number of electrons: In a neutral atom (non-ionic) the number of electrons is equal to the number of protons.

$\text{Number}\text{of}\text{electrons}\text{=}\text{Number}\text{of}\text{protons}$

Given:

The table for three of the naturally occurring isotopes of silicon.

	Atomic symbol
	$\text{S}\text{i}$	$\text{S}\text{i}$	$\text{S}\text{i}$
Atomic number
Mass number
Number of protons
Number of neutrons
Number of electrons