Explanation Given: H 80 202 g For given atom H 80 202 g , 202 is called the mass number and 80 is the atomic number . This is the universal method of writing an atomic symbol. Formula used: A A T O M I C N U M B E R M A S S N U M B E R T O M I C S Y M B O L The number of protons: Atomic number is the number of protons in an atom of an element. In our example above of Mercury atom, Hg is the atomic symbol and 80 is the atomic number, i.e. the number of protons in an atom of Mercury atom denoted by the symbol Hg is 80. It also implies that every atom of Mercury has 80 protons in it. If we add or remove the proton the element also changes, this is what happens in nuclear fission/fusion reactors. The number of electrons: The number of electrons in an atom is equal to the number of protons. This is because by definition an atom is electrically neutral i.e. the overall charge of an atom is zero. So in the above example of Mercury atom denoted by Hg the number of electrons is also 80. An atom can gain or lose electrons, becoming what is known as an ion. An ion is than an electrically charged atom. Adding or removing electrons from an atom does not change which element it is, just its net charge. Calculations: The number of neutrons: The mass number is the sum of the number of protons and neutrons. Mass number = No. of protons + No. of neutrons For the above example of Mercury atom denoted by Hg 202 = no. of protons + no

13th Edition

ISBN: 9781292228860

Author: Timberlake

Publisher: PEARSON

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Chapter 4, Problem 4.100APP

Interpretation Introduction

To determine: To identify the number of protons, neutrons and electrons in an atom of given element.

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Chapter 4, Problem 4.99APP

Chapter 4, Problem 4.101APP

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Chapter 4 Solutions

CHEMISTRY

Ch. 4.1 - Write the symbols for the following elements. a....Ch. 4.1 - Prob. 4.2PP Ch. 4.1 - 4.3 Write the name for the symbol of each of the...Ch. 4.1 - Prob. 4.4PP Ch. 4.1 - Prob. 4.5PP Ch. 4.1 - Prob. 4.6PP Ch. 4.2 - 4.7 Identify the group or period number described...Ch. 4.2 - 4.8 Identify the group or period number described...Ch. 4.2 - Prob. 4.9PP Ch. 4.2 - 4.10 Give the symbol of the element described by...

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