Atoms, Isotopes and Ions

Atoms, Isotopes and Ions
Copyright © 2010 by Darrell Causey, Jr.

The Atom Mostly space Very small dense nucleus Protons (e+)
Neutrons (e0) Electrons (e-) Copyright © 2010 by Darrell Causey, Jr.

Periodic Table Info Name Symbol Atomic Mass Atomic Number

Ca Nuclear Symbols 40 +2 20 mass number charge atomic number

Stable Atom Ca A stable atom has no charge. 40 20 no charge

Atomic Number Ca The number of protons in the nucleus. 40 20

Mass Number Ca The sum of the protons and neutrons. 40 20 mass number

Ions An atom that has a charge because it gained or lost electrons.

e- Remember An electron is negative.

So … Cation An ion that loses electrons is positive and called a …

And … Anion An ion that gains electrons is negative and called an …

Nuclear Symbol Practice

Na How many … cation protons 11 neutrons 12 electrons 10 23 + 11

O How many … anion protons 8 neutrons 8 electrons 10 16 2- 8

Cl How many … anion protons 17 neutrons 18 electrons 18 35 - 17

C How many … atom protons 6 neutrons 8 electrons 6 14 6

H How many … cation protons 1 neutrons 1 electrons 2 + 1

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