Lightest at Upper Left: Hydrogen,
Then by row from Left to the Right and
Then the next Rows down y'under.
The same way as you'll read the lines in a book or letter.
in order of their reletive atomic masses
He is the founder of the periodic table. He arranged the elements according to the atomic masses. Few changes are made in his periodic table to make the modern periodic table.
Mendeleev discovered old periodic table. He arranged elements in order of atomic masses.
Mendeleev's table was arranged according to increasing atomic masses , which had certain drawbacks. Now, modern periodic table is arranged in order of increasing atomic number.
Mendeleev arranged the elements in a table in the increasing order of atomic masses and repeating periodic properties. In the modern long-form of periodic table, the elements are arranged in the increasing order of atomic number and repeating periodic properties.
Mendeleev arranged elements in his periodic table on the basis of increasing atomic masses.
Dmitri invented a periodic table in 1869 where he arranged the elements in order of increasing atomic masses.
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
In the first Periodic Table by Mendeleev, he arranged the elements in the increasing order of their atomic masses and repeating properties.
Dmitiri Mendeleev arranged the Periodic Table of elements in order of increasing atomic masses.
Dmitri Ivanovich Mendeleev
Mendeleev arranged the elements are arranged in order of increasing atomic masses. He founded that properties of elements are periodic when arranged in this pattern.