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In Mendeleev's period table, the elements were arranged by both weight and valence. Mendeleev noticed certain elements were very close in weight and properties and hypothesized other elements that would lie between them. These were the basis of groups. He also noticed weights increased regularly and formed these into periods.
it has elements
There are either 118 or 117 elements in the peiodic table. it depends on the one that you are looking at.
Chemists....
DiscoVery of new elements
In Mendeleev's period table, the elements were arranged by both weight and valence. Mendeleev noticed certain elements were very close in weight and properties and hypothesized other elements that would lie between them. These were the basis of groups. He also noticed weights increased regularly and formed these into periods.
They used atomic number instead of Atomic Mass to organize the elements
Ne=Neon
it has elements
most elements in the peiodic table are classified as metalloids
There are either 118 or 117 elements in the peiodic table. it depends on the one that you are looking at.
To understand the concept of Periodic Table
Chemists....
DiscoVery of new elements
He left too many spaces between the elements......
because they did not feel that his table was well enough to be used world wide.
kadaghan ra ug peiodic table...didto tanawa iu....budang