Research Biology Mr. Luis A. Velazquez Ions. I ons are form when an atom lose or gain electrons I ons are classify in two categories. Positive and Negative.

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Presentation transcript:

Research Biology Mr. Luis A. Velazquez Ions

I ons are form when an atom lose or gain electrons I ons are classify in two categories. Positive and Negative + - Positive ions are known as cations. Negative ions are known as anions. If you know the valence number you know how big is the charge Example: Valence 1= +1 2= +2

Positive ions loose electrons The amount of electrons they loose becomes the positive charge of the ion. Negative ions gain electrons The amount of electrons they gain becomes the Negative charge of the ion.

Positive ions are columns 1A, 2A, and 3A Negative ions are column 5A, 6A, 7A Transitional metals may have more than one positive ions. Example: Iron (Fe) + 2 or + 3 Copper (Cu) + 1 or + 2

No Reaction Transitional Metals Negative Positive They may have more than one charge PositiveNegative

Understanding the ions Na P= N= E= Element Na P= N= E= Positive ion (cation) Na +1 ion

Understanding the ions F 9 19 P= N= E= Element F 9 19 P= N= E= 10 9 Negative ion (anion) F ion

Understanding the ions Na P= N= E= Elements F 9 19 P= N= E= Noble Gas Ne P= N= E=10

Understanding the ions K P= N= E= Elements Cl P= N= E= Noble Gas Ar P= N= E= _

Lithium (Li) will try to be stable as______ noble gas. Helium Lithium (Li) will be positive or negative. Lithium (Li) will be called anion or cation. Bromine (Br) will be called anion or cation. Bromine (Br) will try to be stable as ______ noble gas. Krypton Bromine (Br) will positive or negative.

Lost or Gain of Electrons Cation or Anion Positive or negative Ion Stable noble gas compare to Correct ion symbol Mg N I Rb Ba S Al Ca B Cs Be O P Element LostCationpositiveNeMg +2

Research Biology Mr. Luis A. Velazquez Isotopes

Isotope have a different number of neutrons. Isotope is the lost or gain of neutrons. Isotopes differ in the atomic mass. Isotopes are radioactive. Many atoms have one or more isotopes.

Hydrogen H 1 1 Proton Electron Neutron Protium + -

Hydrogen H 1 2 Proton Electron Neutron Deuterium + -

Hydrogen H 1 3 Proton Electron Neutron Tritium + -

Carbon C 6 11 Proton Electron Neutron Carbon

Carbon C 6 13 Proton Electron Neutron Carbon

Present three isotope for each atoms Li Rb Ag Br Be K S

Present three isotope for each atoms Ca Ca Ca 20 P_______________________________ E_______________________________ N_______________________________ Atom Isotopes