The horizontal rows are called periods, there are 7.
The vertical rows are groups and there are 18.
the elements in the modern periodic table are arrange in the increasing order of their atomic numbers.
In the modern version of the periodic table, the elements are arranged in increasing order of the atomic number. The chemical properties of an element can be predicted by its group. For example group 1 elements react violently to give away one electron to form +1 ions where group 18 elements are inert in standard temperature and pressure. This periodic table was introduced by Henry Mosley.
In Mendeleev's periodic table the elements are arranged in increasing atomic mass and repeating properties whereas in in the modern periodic table the elements are arranged in increasing atomic number and repeating properties.
He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.
Henry Moseley founded modern periodic table. He proved that atomic number is the fundamental property to arrange the elements.
Mendeleev arranged the elements in the periodic table according to their atomic masses.
The Periodic Table of Elements.
atomic weight
the elements in the modern periodic table are arrange in the increasing order of their atomic numbers.
He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.
In the modern version of the periodic table, the elements are arranged in increasing order of the atomic number. The chemical properties of an element can be predicted by its group. For example group 1 elements react violently to give away one electron to form +1 ions where group 18 elements are inert in standard temperature and pressure. This periodic table was introduced by Henry Mosley.
In Mendeleev's periodic table the elements are arranged in increasing atomic mass and repeating properties whereas in in the modern periodic table the elements are arranged in increasing atomic number and repeating properties.
He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.
The periodic table used to be arranged by increasing atomic mass. Now, it is arranged by increasing atomic number (number of protons in an atom of element).
Henry Moseley founded modern periodic table. He proved that atomic number is the fundamental property to arrange the elements.
Atomic Mass. Later on, we discovered that the transition metals did not always have the same mass, which made it difficult to rely on is periodic table. we now arrange it by atomic number.
Mendeleev used atomic mass to arrange periodic table.He gave his model in 1869.