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Because some of the elements were not yet discovered so he left them blank for other elements to be discovered.
-bobby corner
What else can I help you with?
What are the horizontal from left to right parts of the periodic table called?
The horizontal rows are referred as periods. There are 7 periods in periodic table.
How many rows are there in Modern periodic table?
There are 7 periods in the modern periodic table.
Where are the periods located on the periodic table?
Periods on the periodic table are the horizontal rows that go from left to right.
What do you call the horizontal sections of the periodic table?
The horizontal sections of the periodic table are called periods.
What are the horizon rows in the periodic table called?
The horizontal rows on the periodic table are called periods.
Why the improvement in Mendeleevs periodic table was made?
To understand the concept of Periodic Table
Main idea of mendeleevs first periodic table?
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
What are the rows in the periodic table caaled?
The rows in the periodic table are called periods. There are 7 periods in periodic table.
What are characteristics of periods in the periodic table?
Periods have same shells. There are 7 periods in periodic table.
How many periods of element are on a periodic table?
The periodic table has 7 periods on it.
Are periods horizontal rows on the periodic table?
rows. the vertical columns are called periods
What were mendeleevs discoveries and predictions and discoveries abot the periodic table?
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
What changes were made to the periodic table after Dmitri mendeleevs discovery?
they changed the 3 new Elements.
Mendeleevs periodic table was useful because it enabled scientists to predict properties of unknown?
elements
How many periods are there on the modern periodic table?
The modern periodic table has seven periods.
What are periods in the periodic table best represnted by?
The horizontal rows on the periodic table are periods.
Which two elements on the periodic tabel would have been placed in different groups in moseleys periodic table but not in mendeleevs?
bi and po
