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1 of 11© Boardworks Ltd 2012 Ions
2 of 11© Boardworks Ltd 2012
3 of 11© Boardworks Ltd 2012 Compounds are formed when different elements chemically react and form bonds with each other, e.g. water (H 2 O). Elements are made up of just one type of atom, sometimes joined to other atoms of the same element by chemical bonds. This forms molecules such as chlorine (Cl 2 ). What are bonds? Different types of bonds are formed depending on the types of atoms involved: ionic bonding occurs between metal and non-metal atoms. covalent bonding occurs between non-metals atoms only. All bonding involves changes to the number of electrons in the outer shells of atoms.
4 of 11© Boardworks Ltd 2012 Why do atoms form bonds?
5 of 11© Boardworks Ltd 2012 An ion is an atom or group of atoms that has an electrical charge, either positive or negative. Atoms have an equal number of protons and electrons and so do not have an overall charge. Atoms with incomplete outer electron shells are unstable. By either gaining or losing electrons, atoms can obtain full outer electron shells and become stable, just like the noble gases. When this happens, atoms have an unequal number of protons and electrons and so have an overall charge. This is how atoms become ions. How do atoms form ions?
6 of 11© Boardworks Ltd 2012 Positive and negative ions
7 of 11© Boardworks Ltd 2012 Building an ion
8 of 11© Boardworks Ltd 2012 Calculating ion charges
9 of 11© Boardworks Ltd 2012 What is a compound ion? Ions can be made up of a single atom or a group of atoms. An ion made up of a group of atoms is called a compound ion. hydroxide sulfate nitrate carbonate ammonium IonFormulaChargeAtoms present NH 4 + CO 3 2- NO 3 - SO 4 2- OH - OOOOOOOOOOO H HHHH C N N S What atoms are present in the following compound ions?
10 of 11© Boardworks Ltd 2012 Comparing positive and negative ions
11 of 11© Boardworks Ltd 2012 Naming ions and compound ions There are two common types of ions: –ide ions and –ate ions. What is the difference? Generally, –ide ions are negatively-charged ions of an element, e.g. sulfide (S 2- ), fluoride (F - ), oxide (O 2- ). The exception to this rule is the hydroxide ion, which contains both hydrogen and oxygen (OH - ). –ate ions are negatively-charged compound ions that include oxygen, e.g. sulfate (SO 4 2- ), nitrate (NO 3 - ), carbonate (CO 3 2- ).
© Boardworks Ltd of of 50© Boardworks Ltd 2007.
© Boardworks Ltd of 20 © Boardworks Ltd of 68 KS4 Chemistry Ionic Bonding.
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© Boardworks Ltd of 10. © Boardworks Ltd of 10 What is ionic bonding? Compounds that contain ions are called ionic compounds. These compounds.
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Chemical Bonding. Chemical Bond A force that holds two or more atoms together ◦ This happens because atoms prefer to have a full outer shell ◦ Atoms can.
CHEMICAL BONDING. INTRODUCTION Atoms do not tend to exist on their own Atoms do not tend to exist on their own Most often, they are found joined together,
Chemical Bonds Ionic and Covalent Bonds. Chemical Bonds.
ELEMENTS Remember: Atoms of one type form an element –A bunch of gold atoms form gold…etc. Elements are the simplest form of a substance Every element.
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Ionic Bonds /. Ch. 4-1: p.p An atom that gains one or more electrons will have a ____________________ charge. An atom that loses one or more.
Reactions of group 1 metals with oxygen The group 1 metals all react in a similar way because ……….
Chapter 7 Chemical formulas and Bonding Elements tend to react to fill out their outer electron shell (s and p orbitals). This results in a more stable.
Chemical Bonding Atoms and Valence Electrons. Chemical Bond: the force of attraction that holds atoms together as a result of the rearrangement of electrons.
Chemical Bonds Chapter 19. Stability in Bonding Some elements combine chemically and no longer have the same properties they did before forming a compound.
Objective: To describe how atoms bond together to form compounds using valence electrons Journal: ◦ How many protons, neutrons and electrons are in.
Chemical Bonds Why Atoms Combine?. Why Would Elements Want to Combine? Most elements are unstable The only stable elements are the _____? So elements.
Bellringer 1.Draw a model for the following elements: A. Sodium B. Chlorine 2. How many valence electrons does sodium have? 3. If sodium lost its valence.
CHEMICAL BONDS. IONIC BONDS Form when electrons are completely transferred from one atom to another. Atoms are electrically neutral. Charged particles.
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Isotope: Same element (same number of protons) but with different number of neutrons. Same # of Protons Different amount of Neutrons We know these are.
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Chapter 2: Sections 3 Ionic Bonds What is an Ion? An atom or group of atoms that has become electrically charged An atom or group of atoms that has become.
Chemical Bonds. Cl - Na + Basics to Bonding When atoms join they create a chemical bond. – This chemical bond: is the force that holds two atoms together.
Ion – atom or group of atoms that has an electric charge Ionic bonds form when atoms gain or lose electrons. When an atom loses an electron, it.
Connecting Atoms Overview. Handouts and Worksheets for Chapters 4,5,6 ‘The Chemical Investigator’ 12 – 20 Naming ionic compounds practice worksheet Lots.
Identify the elements present in each of the following compounds and the number of each element atom present. Common salt: NaCl Nitric acid: HNO 3 Carbon.
Ions and Ionic Bonding L.O. To know how atoms form ions and be able to represent ionic bonding.
4 – Investigate and describe the compounds formed by bonding elements. 3 – Describe why certain elements bond with others. 2 – Use the periodic table.
Polyatomic compounds combine polyatomic ions with metals Poly atomic ions are groups of atoms that tend to stay together and carry an overall ionic.
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