2.1 Periodicity
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What is the definition of periodicity?
• Pattern in properties across a row which is repeated in each row
What is the trend in atomic radius across a period?
• Shielding is negligible • Proton number increases • FOrce of attraction between nucleus and outer electrons increases • Radius decreases
What is the general trend in first ionisation energy across a period?
• Increases • More protons • Atomic radius decreases • Shielding is negligible
What is the general trend of electro negativity across a period?
• Increases • More protons • Shielding is negligible • Smaller atomic radius • Nucleus is more able to attract a covalent bond
Why does melting point increase between sodium and aluminium?
• Al has higher charge • Al has more delocalised electrons • Smaller ions
Why do giant covalent structures have such high melting points?
Have to break many strong covalent bonds
Why does Barium Chloride need to be acidified when testing for sulphates?
Both sulfates and sulfites produce a white precipitate but sulfites are soluble in acids so it avoids confusion