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periodic table - Coggle Diagram
periodic table
group 0
all the elements in group 0 are unreactive non-metals.
group 7
what happens as you go down the elements
the atoms become larger
the outer shell becomes further from the nucleus
the force of attraction between the nucleus and the outer shell decreases
an outer electron is gained less easily
the halogen becomes less reactive
group 1
The reactivity of Group 1 elements increases as you go down the group because:
the atoms get larger as you go down the group
the outer electron gets further from the nucleus as you go down the group
the attraction between the nucleus and outer electron gets weaker as you go down the
group - so the electron is more easily lost
all the elements in group 1 are reactive metals
history
mendeleev
1869 Rushton chemist Dimtrv mendeleev
he ordered the periodic table in atomic number
this meant that he could predict new elements and leave gaps fore them
newlands
1864
new land develops label of octaves
was organised in atomic mass
the problem with is design
he did not leave gaps for undiscovered elements
trends
why?
trends are important because they help us to make accurate predictions about elements
what?
trends are patens in the periodic table
for example trends is that some elements get more reactive as they go down the periodic table
e.g. group one elements get more reactive as they go down but group 7 elements get less reactive.
