the explanation will be depending on the bonding and structure of the elements

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check table 10.5

​pattern of melting point

electrical conductivity of Na-Al

similar to melting point, electrical conductivity is increasing from Na to Al, due to:

1. increase in no of electrons donated to the sea of delocalized electrons

2.​

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decrease mp

Cl2 is smaller than S8

Ar exists as monoatomic gas

weaker id-id force​

​S8 to Cl2 to Ar

increase m.p

as molecules get bigger, more electrons present

stronger instantaneous dipole-induced dipole​

P4 to S8

P4 to S8 to Cl2 to Ar

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all of the nonmetals elements, from P4 to Ar are non electrical conductor

no delocalized electrons are present

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IE increases due to

1. increasing nuclear charge

2.electrons are filling the same shell/energy level /similar shielding effect

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across the period

IE decreases due to

1. increasing shielding effect/increasing quantum shell

2. increase shell has outweighed the increase in nuclear charge

3. weaker force of attraction​

​down the group

have it a review from section 2.6

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