
UNIT # 3
Introduction
Objectives
Reading
3.1 Structure of the Atom 3.2 Isotopes 3.3 Arrangement of Electrons 3.4 Electron Configura tions 3.5 Atomic Mass
Problems 1 \| 2 \| 3

ATOMIC STRUCTURE

3.1 - Structure of the Atom

3.1.1 - Atomic Number - The number of Protons in an atom

The number of protons in the nucleus of an atom is very important.

The number of protons:

determines the identity of an element. (In section 2.4, we learned that elements are pure substances.)
Click here to take a look at the identities of atoms having 1 to 10 protons in its nucleus.
is also known as the atomic number of the atom.

The periodic table of elements SHOWS you the atomic number of each element. If you know where to look for the atomic number of an element on the periodic table, you would know the how many protons are in the nucleus of the element. Take a look at the periodic table closely to verify the number of protons for the first 10 elements by clicking on the symbol of the element.

Periodic Table of the Elements
Section 4.4
Electrons, Protons, and Neutrons. Atomic Number ..p83

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ATOMIC STRUCTURE 3.1 - Structure of the Atom

ATOMIC STRUCTURE

3.1 - Structure of the Atom