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2907558
The Periodic Table
Descrição
Mapa Mental sobre The Periodic Table, criado por rossc99 em 08-06-2015.
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chemistry
the periodic table
Mapa Mental por
rossc99
, atualizado more than 1 year ago
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Criado por
Clodagh Mullins
quase 9 anos atrás
Copiado por
rossc99
quase 9 anos atrás
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Resumo de Recurso
The Periodic Table
Early periodic Table
Medeleev/Newlands
Both arranged elements by their ATOMIC WEIGHT
the list was arranged in a able so elements with similar properties were in the same groups
Anotações:
newlands discovered the law of octaves but If the atomic weight was strictly followed it only worked until calcium
Mendeleev realised that some had not yet been discovered and left gaps for them
Modern Periodic Table
electrons/protons/neutrons all discovered in the early 20th centuary
now we arrange by atomic (proton) number
now all elements are in the appropriate places
a table arranged in terms of electronic structures
Group 1- alkali metals
Anotações:
further down = more reactive, also means it has a lower melting point and boiling point
low density
react with non-meatals to form ionic compounds
form 1+ ions
form chlorides
white solids, dissolve in water to form colourless solutions
react vigorously with water, releasing hydrogen
when reacted with water form hydroxides, they are soluble in water and give an alkali solution
Transition elements
ductile
good conductors
hard+strong
malleable
high densities
high mp/bp apart from mercury
less reactive and don't react as vigorously w/ water or oxygen
form coloured compounds as they have different ions e.g. Fe1 and Fe3
good catalysts
Halogens
react w/ metals to form ionic compounds
Halide ion carries charge of -1
further down the group the element is...
less reactive
higher mp/bp
more reactive halogen can displace a less reactive halogen from an aqueous solution of it's salt
trends in the table can be explained by the energy levels
Anotações:
more shells = electrons easly lost and less are easily gained
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