Trends in the properties of the Period 3 elements
- Created by: LegendofZelda
- Created on: 02-04-18 18:12
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- Period 3 and its trends
- Melting and boiling point
- Increase from Na to Al
- Strength of metallic bond increases
- Charge on ion increases-more electrons join the delocalised sea and so strengthen bond
- General decrease from semi-metals to non-metals
- Depends on size of VDW forces and how close molecules pack together
- The larger the VDW forces, the higher the mp and bp
- S8 > P4 > Cl2
- Depends on size of VDW forces and how close molecules pack together
- Increase from Na to Al
- Atomic Radii
- Dependent on the bonds being formed e.g. covalent, ionic etc.
- Decreases across period
- Increase in nuclear charge as protons and electrons are added as your progress from left to right
- Increase in N.C means shells are highly attracted to nucleus and pulled further in towards it
- No increase in electron shells so no extra shielding
- Increase in N.C means shells are highly attracted to nucleus and pulled further in towards it
- Increase in nuclear charge as protons and electrons are added as your progress from left to right
- Taken to be half the distance between the centres of a pair of atoms
- No point in an atom where the electron cloud drops to zero so two atoms are used
- First Ionisation Energy
- Energy needed to remove one mole of electrons from one mole of gaseous atoms, forming a +1 charge ion
- Increases across a period
- Nuclear charge increases as proton number increases across
- Makes it harder for an electron to be removed across the period and more energy is required
- Nuclear charge increases as proton number increases across
- Drop from one period to the next
- Increase in atomic radius so attraction decreases due to an extra shell being added
- Melting and boiling point
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