0
His original 1869 table had the atomic weights increasing down columns, and family members alongside each other in horizontal rows.
His revised and greatly improved 1871 version had atomic weights increasing across rows, and element families in vertical columns, essentially similar to the way a modern Periodic Table is presented.
What else can I help you with?
What is the trend for atomic radius horizontally and vertically on the periodic table?
Horizontally: decreasing from left to right.Vertically: increasing from top to bottom.
Which way are periods on a periodic table?
Periods are horizontal.Groups are vertical.Just think group = up and downperiod= right and left
What is each horizontal row of the periodic table called?
vertically they're called groups and horizontally 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.
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
What is the trend for atomic radius horizontally and vertically on the periodic table?
Horizontally: decreasing from left to right.Vertically: increasing from top to bottom.
Why the improvement in Mendeleevs periodic table was made?
To understand the concept of Periodic Table
How many vertical rows are on the periodic table?
There are NO vertical ROWS, because rows run horizontally, and COLUMNS run vertically. There are 18 vertical columns in the periodic table.
What is a periodic row?
On the Periodic Table of elements, elements that align horizontally are said to be in the same row, and objects that align vertically are said to be in the same group.
Which way are periods on a periodic table?
Periods are horizontal.Groups are vertical.Just think group = up and downperiod= right and left
What is each horizontal row of the periodic table called?
vertically they're called groups and horizontally periods
How are groups on a periodic table numberd?
From right to left (1- 18) on the periodic table. Instead of up and down (1-7) periods go vertically. (rows) groups go horizontally. (columns)
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 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
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
