How was modern periodic table bases different than the mendeleev periodic table? State the modern periodic law.
Answers
Explanation:
Mendeleev's periodic table
Modern periodic table
Mendeleev's periodic table is based on atomic mass. Elements are arranged in increasing order of atomic mass.
Modern periodic table is based on atomic number.
Elements are arranged in increasing order of atomic mass.
There are a total of 7 groups and 6 periods. There are a total of 18 groups and 7 periods.
Elements having similar properties were placed directly one another. Elements having same valence shell were placed in the same period while elements having the same number of valence electons were placed in the same period.
Answer:
Mendeleev's Periodic Law states that the properties of elements are periodic functions of their atomic weights. Whereas, the Modern Periodic Law states that the properties of elements are periodic functions of their atomic numbers.