Trends across period 3

Description

A level Chemistry (Bonding) Flashcards on Trends across period 3, created by Irene Binil on 14/11/2017.
Irene Binil
Flashcards by Irene Binil, updated more than 1 year ago
Irene Binil
Created by Irene Binil almost 7 years ago
95
4

Resource summary

Question Answer
Trends in melting and boiling point across period 3 The genral trend is that the melting and boiling points increases and then decrease as you move across period 3
Na to Mg to Al The melting points increase from Na to Mg to Al becuase the strength of the metallic bonding increases. Na only forms +1 ions, Mg +2 ions and Al +3 ions, also Na is the largest ion and Al is the smallest, so Na has the weakest force between the ions and delocalised electrons.
Si Silicon has the highest melting point as it has a gaint macromolecular structure held together by strong covalent bonds. these require a lot of energy to break apart thus Si has a high melting point.
P to S to Cl P exists as P4 tetrahedrons, S exists as S8 rings and Cl as Cl2. the melting point of these elements depends on the van der waals force between the molecule. S8 is big rings so it has the strongest Van der waals and Cl is diatomic so it has the weakest Van der waals.
Ar Argon exists as a single atom thus it only has weak Van der waals resulting in the lowest boiling point.
Show full summary Hide full summary

Similar

Ionic Bondic Flashcards.
anjumn10
Chemistry 3 Extracting Metals Core GCSE
Chloe Roberts
Acids and Bases
Sarah Egan
Using GoConqr to study science
Sarah Egan
Electrolysis
lisawinkler10
Acids and Bases
silviaod119
Elements, Compounds and Mixtures
silviaod119
Chemistry General Quiz - 2
lauren_johncock
Chemistry Quiz General -3
lauren_johncock
Chemistry Module C2: Material Choices
James McConnell
AS Chemistry - Enthalpy Changes
Sarah H-V