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Which group of elements are the most stable?
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• Why do atoms gain or lose valence electrons?
TO BECOME STABLE
• Why do atoms gain or lose valence electrons?
• Which group of elements are the most stable?
NOBLE GASES
• Which group of elements are the most stable?
• Why are noble gases stable?
THEY HAVE A FULL SHELL OF VALENCE ELECTRONS
• Why are noble gases stable?
• What does each dot represent in an electron dot diagram?
EACH DOT REPRESENTS A VALENCE ELECTRON.
• What does each dot represent in an electron dot diagram?
• Which elements generally have higher ionization energies?
NONMETALS HAVE HIGHER IONIZATION ENERGY THAN METALS, NOBLE GASES ARE
HIGHEST
• Which elements generally have higher ionization energies?
• What happens to valence electrons when atoms form ionic bonds?
VALENCE ELECTRONS ARE TRANSFERRED OR GIVEN
AND TAKEN.
• What happens to valence electrons when atoms form ionic bonds?
• What are the properties of ionic compounds?
1. SOLID CRYSTALS.2. HIGH MELTING POINT.3. BRITTLE.
• What are the properties of ionic compounds?
• Which types of atoms bond to form molecules?
NONMETALS BOND TOGETHER TO FORM
MOLECULES
• Which types of atoms bond to form molecules?
• What type of molecule is formed when two atoms of the same nonmetal join together?
DIATOMIC MOLECULE
• What type of molecule is formed when two atoms of the same nonmetal join together?
• What holds atoms together in an ionic bond?
THE ATTRACTION BETWEEN POSITIVE CATIONS AND
NEGATIVE ANIONS
• What holds atoms together in an ionic bond?
• What holds atoms together in a covalent bond?
THE SHARED VALENCE ELECTRONS ATTRACT AND
HOLD THE ATOMS IN.
• What holds atoms together in a covalent bond?
• What holds metal atoms together in a metallic bond?
THE ATTRACTION BETWEEN A METAL CATION AND THE
SHARED SEA OF ELECTRONS
• What holds metal atoms together in a metallic bond?
• Why are metals good conductors of electricity?
THE SEA OF ELECTRONS ALLOWS ELECTRICITY TO
PASS THROUGH.
• Why are metals good conductors of electricity?
• Why does water form drops or puddle up?
WATER MOLECULES ARE POLAR AND ARE ATTRACED
TO EACH OTHER - COHESION.
• Why does water form drops or puddle up?
• Which types of elements will always form cations or positive ions?
METALS OR GROUP 1A, GROUP 2A AND GROUP 3A
• Which types of elements will always form cations or positive ions?
• Which types of elements will always form anions or negative ions?
NONMETALS, OR GROUP 5A, GROUP 6A AND GROUP 7A
• Which types of elements will always form anions or negative ions?
• In an ionic compound, the positive and negative charges must add up to what sum?
POSITIVE AND NEGATIVE CHARGES MUST ADD UP TO
ZERO.
• In an ionic compound, the positive and negative charges must add up to what sum?
• In a chemical formula, which element is written first?
METALS, POSITIVE CHARGES, OR LOWER
GROUP NUMBER GO FIRST.
• In a chemical formula, which element is written first?
• When do you need to add a numerical prefix in a chemical name?
WHEN NONMETALS FORM A COVALENT MOLECULE.
• When do you need to add a numerical prefix in a chemical name?
• What does the subscript 2 mean in the formula H2O?
THE SUBSCRIPT MEANS THERE ARE TWO HYDROGEN
ATOMS.
• What does the subscript 2 mean in the formula H2O?
• What do roman numerals such as II, III or IV mean in a chemical name?
A ROMAN NUMERAL INDICATES THE ION’S
POSITIVE CHARGE.
• What do roman numerals such as II, III or IV mean in a chemical name?
• What is an alloy?
A MIXTURE OF TWO OR MORE ELEMENTS AT LEAST ONE OF WHICH IS A METAL.
• What is an alloy?
• What are some common alloys?
STEEL – IRON AND CARBON.BRASS – ZINC AND COPPER.
AIRCRAFT ALUMINUM – ALUMINUM AND
MAGNESIUM.
• What are some common alloys?