glenn seaborg
Moseley discovered modern periodic table. It was not given by Bohr.
The scientist who recognized the periodic table for atomic number was Henry Moseley. He discovered that elements should be ordered by atomic number rather than atomic mass, which led to the modern understanding of the periodic table.
Dmitri Mendeleev is credited with developing the periodic table of elements in 1869. He organized the elements based on their atomic mass and properties, predicting the existence of elements yet to be discovered. His periodic table laid the foundation for our modern understanding of the chemical elements.
The Periodic Table has 18 groups and 7 periods.
In the periodic table of the elements there are 7 periods and 18 groups. The rows are called periods and columns are called groups. You may be getting confused by the lanthanides and actinides. These groups of elements are found in two rows at the bottom and seem to not be a part of the table. However, if you find and extended version of the table you will see that, technically, these two rows belong in Periods 6 and 7.
glenn seaborg
Moseley discovered the modern periodic table.
Mendeleev
Moseley discovered modern periodic table. It was not given by Bohr.
The scientist who recognized the periodic table for atomic number was Henry Moseley. He discovered that elements should be ordered by atomic number rather than atomic mass, which led to the modern understanding of the periodic table.
The Ancients
These elements are termed as 'lanthanides' and 'actinides' have certain different characteristics that cannot be fitted into modern periodic table,hence they are placed at the bottom.
Dmitri Mendeleev is credited with developing the periodic table of elements in 1869. He organized the elements based on their atomic mass and properties, predicting the existence of elements yet to be discovered. His periodic table laid the foundation for our modern understanding of the chemical elements.
The Periodic Table has 18 groups and 7 periods.
Dmitri Mendelev was a Russian scientist who created the first modern periodic table of elements.
Dmitri Mendeleev is the scientist who is credited with first arranging and classifying elements into a chart that laid the foundation for the modern periodic table. Mendeleev's periodic table arranged elements by their atomic weight and predicted the properties of unknown elements that were yet to be discovered.
when the periodic table was first made, it only had the basic elements eg. hydrogen, oxygen, etc. Now with scientist finding more elements and creating them eg. americum, einstienium or europium, there are more elements than ever before. An element only has to exist for 2 seconds before they put it on the periodic table.