4.2 group 7 elements
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what are the trends in properties in group 7 elements
Diatomic get darker down the group MP/BP increases down the group
what do you call group 7 elements
Halogens
what are halogens
covalently bonded, simple molecular bonds
What happens with the reaction of metals
The outer shell electrons from the metal are transferred to the halogen
what anagram helps us understand reduction and gain with halogens and metals
OIL RIG Oxidised= loose electrons Reduction = gain electrons
what happens as you go down the periodic table with halogens
Halogens get less reactive down the group
how do halogens react
by gaining electrons
What are facts about halogens (group 7 elements)
7 outer shell electrons very reactive react by gaining an electron to form ions or sharing an electron in a covalent bond boiling points increase down the group as molecules are heavier + intermolecular forces are stronger and they require more energy to overcome as elements they are Diatomic
why do the halogens get less reactive as you down the periodic table
Atoms have more electrons shells the extra electron is further from the nucleus So its attraction to the nucleus is weaker
what is the test for chlorine
Damp blue litmus paper turns white if present