periodic table Flashcards
What happens when group 1/alkaline metals react with water?
-they react vigourasly
-produces metal hydroxide solution.This alkaline
-also produces hydrogen- this is why you see fizzing
What is the word+symbol equation for alkaline metals+water?
W- Sodium+water- sodium hydroxide+hydrogen
S-2Na+2H2O- 2 NaOH+H2
What happens when group 1/alkaline metals react with oxygen?
-Form metal oxides
What happens to Group 1 elements going down the group?
-become more reactive
- the outermost shell gets further form the nucleus- attraction between outermost electrons+nucleus becomes less
What are the properties of the halogens/group 7 metals?
As atomic number increases -elements have darker colour+higher boiling point
What is chlorine at room temperature?
-fairly reactive
-poisonous
green gas
What is Bromine at room temperature?
- poisonous red-brown liquid
-gives of orange vapour at room temp
What is iodine at room temperature?
-dark grey crystalline
- gives of purple vapour when heated
What is the trend in reactivity in group 7?
- as u g down 7 the halogens become less reactive- it gets harder to attract the extra electron to fill the outer shell when its further away from the nucleus(atomic radius is larger)
What is displacement reaction?
-when a more reactive metal displaces and less reactive metal in it’s compound.
What is oxidation and reduction?and what type of reaction do they take place in?
-O - loss of electrons R-gain in electrons
-they happen simultaneously in displacement reactions
-Redox reactions
What is an oxidising and a reducing agent?
-OA-accepts electron and gets reduced
-RA-donates electrons +gets oxidised
