How many groups and periods are there in the Modern Periodic Table? How do the atomic size and metallic character of elements vary as we move:

Answer : The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2).

6 groups are there in the p-block

Modern Periodic law states that “the physical and chemical properties of the elements are periodic functions of their atomic numbers”. When atomic number is taken as fundamental property then abnormalities...

Electronic configuration of Q : 2, 8, 3 Valency of Q: 3 Electronic configuration of R: 2, 8, 5 Valency of R: 8-5=3 P      +      S ----> PS 2,8,1     2,8,7

The properties of elements depend upon valence electrons in the atom which in turn depends on the total number of electrons, i.e., atomic number. Therefore, atomic number is a more appropriate parameter...

(i) Y (ii) 2 each (ii) False, same period but Y lies in group 2 and X in group 16. So, as we mover from left to right size decreases with increase in...

Mendeleev’s Periodic Table Modern Periodic Table Mendeleev's periodic table is based on atomic mass. Elements are arranged in increasing order of their atomic masses. Modern periodic table is based on atomic number. Elements are arranged...

Mendeleev’s periodic table                                      Modern periodic table.                ...

There are 18 groups and 7 periods in the Modern Periodic Table.  (i) # Atomic size increases # Metallic character increases  (ii) # Atomic size decreases  #  Metallic character decreases

Modern Periodic Law states that properties of elements are a periodic function of their atomic number.  In Modern Periodic Table there are18 groups and 7 periods.