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Chemistry C3 Part One

Explore the foundational concepts of the Periodic Table in this detailed revision presentation. Learn about the contributions of Newlands and Mendeleev, who organized elements based on atomic weights and identified repeating patterns. Discover how the Modern Periodic Table arranges elements by increasing atomic number and how the outermost shell influences an element's group number. Delve into the properties of Alkali Metals (Group 1) and Halogens (Group 7), their reactivity trends, and how they form ionic compounds.

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Chemistry C3 Part One

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  1. Chemistry C3 Part One Revision PowerPoint - Big ideas The Periodic Tableorganising elements into groups

  2. Newlands and Mendeleev • Newlands listed the elements in order of atomic weights. He spotted repeating patterns (octaves) in behaviour • Mendeleev arranged elements into groups and periods to fit repeating patterns. He left gaps for undiscovered elements.

  3. Modern Periodic Tables • Modern Periodic Tables arrange elements by increasing atomic number. • The number of electrons in the highest energy level (outermost shell) indicates the group number of the element.

  4. Group 1 - The Alkali Metals • Elements in Group 1 (The Alkali Metals) are soft, low density metals. • Alkali metals react rapidly with water, forming alkalis & hydrogen. • Alkali metals form ionic compounds with non-metals. • Group 1 ions have the charge +1

  5. Reactivity down the group • Group 1 elements become more reactive further down the group. • Large atoms lose electrons from their outer shells more easily because they are further from the positive nuclear charge force and shielded by more inner shells of electrons.

  6. Group 7 – The Halogens • Elements in Group 7 (The Halogens) are coloured non-metals. • More reactive halogens displace less reactive halogens from solutions containing halide ions, e.g. Cl2 + 2Br– → Br2 + 2Cl– • Group 7 ions have a charge of –1

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