What is the trend in atomic radius across a period and why?
-number of protons increases
- electrons are more attracted to nucleus
What is the trend in ionisation energy across a period and why?
- Number of protons increases
- Electrons are more attracted to the nucleus
What are the period 3 mpts?
What is the structure and bonding of Na, Mg and Al?
Metals with metallic bonding - metal ions in a sea of delocalised electrons.
What is the trend in mpts of Na, Mg and Al and why?
Increases - metallic bonds get stronger because...
- metal ions have increasing positive charge
-increasing no. of electrons
- decreasing radius
What is the structure and bonding of Si?
Macromoleular with a tetrahedral structure - bonded with strong covalent bonds.
What is the mpt of Si like and why?
Very high - a lot of energy is required to overcome strong covalent bonds.
What is the structure and bonding of P, S and Cl?
Molecular - held together by Van der Waals.
What is the formula for a P molecule?
What is the formula of a S molecule?
What is the formula of a chlorine molecule?
What are the mpts of P, S and Cl like and why?
- Van der Waals are weak to overcome.
Which of P, S and Cl has the highest mpt and why?
S - it is the biggest molecule (S8)
What is the structure and bonding of Ar?
Ar exists as individual atoms held together by VdWs.
What is the mpt of Ar like?
Very low - hardly any VdWs.