Periodic table and element properties Flashcards
How is the atomic number and the reaction of elements linked
The reactiosn involve the outer shell of electrons and thus the protons or atomic number.
What is the trend in melting and boiling points in group 1
Melting and boiling point decrease as you move down the group
What is the trend in melting and boiling points in group 7
Melting and boiling points increase as you go down the group
What is the trend in melting and boiling points in group 0
Melting and boiling points increase as you go down
Recall the reactivity of group one elements and why this happens
Elements become more reactive as you move down the group because the outer electron gets futher from the nucleus so can escape more easily because attraction from the nucleus is being limited by the shielding electrons
Recall the reactions of the first three Alkali metals with water
Li : fizzes and moves on water
Na:Fizzes more, melts and moves on water and burns with a dull flame
K: Violently fizzes, melts, moves on water and burns brightly
Recall the reactions of the first three Alkali metals with oxygen
Lithium: red flame and forms a white solid
Sodium: yellow flame and forms a white solid
Potassium: purple flame and forms a white solid
Outline the main properties of the group one metals
React violently with halogens 1 electronm in outer shell Low melting points Low density Shiny Good conductors
Recall the flame tests for lithium, sodium, potassium, barium, calcium and copper
Lithium-Red Sodium-Yellow Potassium-Lilac Barium-Apple green Calcium-Brick red Copper-Blue green
What are the advantages of instrumental analysis
More sensitive
More Accurate
Faster to perform
Outline the properties of the halogens
Very reactive with group 1 Not found free in nature All have seven electrons in their outer shell Form 1- ions Non-metalsd Poisonous Brittle
Recall the trend in reactivity and why this happens
Reactivity decreases as you go down the group as there are more shieldimng electrons that limit the force of attraction that the nucleus has on surrounding electrons
Recall the reactions of the halogens with iron wool
Chlorine- iron wool burns and glows brightly
Bromine-burns and glows but less brightly than with chlorine
Iodine-iron wool has a slight glow does not burn
Recall the results of silver nitrate and aqeous halide reactions
Potassium Chloride= white precipitate
Potassium bromide= cream precipitate
Potassium Iodide= yellow precipitate
Recall the trend in reactivity in group 0 elements and why
They are completely un-reactive becasue they have a complete outer electron shell
