The outer electron in the electronic configuration give idea of the group in the Modern Periodic Table & also period.
The elements are arranged on the periodic table in order of increasing atomic number.
Modern periodic table is based on modern periodic law which states that physical and chemical properties of elemnts are periodic function of their atomic numbers.
There are 7 periods in the modern periodic table.
Dmitri Mendeleev developed the modern periodic table in 1869.
Atomic number = number of protons.
He is the symbol given to Helium.It has atomic number 2.It is the noble gas with electronic configuration 1s2.
you cannot determine its electronic configuration through its atomic mass. atomic no is necessary. for this, check modern periodic table.
1
The elements are arranged on the periodic table in order of increasing atomic number.
because its the element that created the earth
The electron configuration of hydrogen is similar with that of alkali metals.
Isotopes are atoms of same element having different atomic mass, but the same atomic number. Isotopes have not been given separate place in the modern periodic table.
modern periodic law
1. The classification of elements is based on the atomic number, which is a more fundamental property. 2. The reason for placing isotopes at one place is justified as the classification is on the basis of atomic number. 3. It explains the periodicity of the properties of the elements and relates them to their electronic configurations. 5. The position of the elements that were misfits on the basis of mass number (anomalous pairs like argon and potassium) could be justified on the basis of atomic number. 6. The lanthanides and actinides are placed separately at the bottom of the periodic table. 7. The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration.
Modern periodic table is based on modern periodic law which states that physical and chemical properties of elemnts are periodic function of their atomic numbers.
There are 7 periods in the modern periodic table.
The modern periodic table has seven periods.