periodicity
- Created by: Margaret Hobart
- Created on: 07-05-21 11:07
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- periodicity (period 3)
- s block, p block and d block
- 1st IE: energy required to remove 1 mol of e- from 1 mol of gaseous atom to form 1 mol of +1 ions
- atomic radius decreases across a period
- proton number increases so nuclear charge increases
- more attraction between nucleus and outer e-
- similar shielding
- proton number increases so nuclear charge increases
- 1st IE generally incenses
- increasing protons
- more attraction between outer e- and nucleus
- exceptions
- Mg and Al
- 3p orbital is slightly further from 3s and has additional sheilding
- P to S
- 3p e- in P are all unpaired
- in S 2 e- are paired
- more repulsion
- Mg and Al
- increasing protons
- melting point varies
- Na to Al
- melting points increase
- number outer e- increase so more can be delocalised
- greater attraction between (+) ions and delocalised e-
- number outer e- increase so more can be delocalised
- melting points increase
- silicon melting point is high
- giant covalent structure
- lots of energy needed to overcome the covalent bonds
- giant covalent structure
- argon is low
- its an atom
- little energy needed to break weak VDWs
- its an atom
- P4, S8 and Cl2
- molecular with VDWs
- bigger molecules have stronger VDWs so suffer is the highest and chlorine is the lowest
- molecular with VDWs
- Na to Al
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