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Cards (10)

How is the modern periodic table arranged
it’s arranged by increasing atomic numbers
How is the old periodic table arranged?
it is arranged by increasing atomic weight
Who made the old periodic table
newlands
What was newlands law called and what did he notice
The law of octave.
He noticed that the properties of every 8th element seemed similar
however he put some elements in groups that had very different chemical properties
so this wasn’t accepted by other scientist
What’s the problem with putting elements in order of atomic weight
The same element can have different isotopes with different weights
What did newlands not do
leave space for undiscovered elements
What did mendeleev put elements in order of
atomic weight
What did mendeleev notice
Physical and chemical properties were related to their atomic weight in a repeating or ‘periodic’ way
How did mendeleev arrange his periodic table
Groups of element with similar properties fell into vertical columns
he left gaps for undiscovered elements and he correctly predicted the atomic weight and properties of these elements
what is a ion
an atom with a charge