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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 6E
Textbook Problem
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Define each term:

a. atomic number

b. mass number

c. isotope

d. ion

e. atomic mass

f. molar mass

g. Avogadro’s number

h. chemical symbol

Interpretation Introduction

Interpretation:

The given terms are to be defined.

Concept Introduction:

A chemical element is a substance that cannot be fragmented or altered into another substance. Each element is specified according to the number of protons found in the atomic nucleus.

Explanation of Solution

a) Atomic number

The atomic number is considered the number of protons found in the nucleus of an atom. It is also called as proton number, represented as Z. In electrically neutral atoms, this number is also equal to the number of electrons orbiting about the atom’s nucleus. Atomic number of an element determines its position in periodic table.

b) Mass number

The mass number of an atom represents the aggregate number of neutrons and protons in the nucleus. It also called as nucleon number, represented as symbol ‘A’.

c) Isotopes

Isotopes represent the atoms of the same elements that contain the same number of protons but different number of neutrons in their nucleus. For example, carbon 12 has six protons and six neutrons and carbon 13 has six protons and seven neutrons.

d) Ion

Ion is as an atom that has either lost or gained electrons in order to form positively or negatively charged atoms. It is represented by a plus or minus sign as cation (ca+) or anion (Cl)

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Chapter 3 Solutions

Chemistry In Focus
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