Explain given reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly like nuclear charge in both situations.
Important Questions on Periodic Classification of Elements
Name the elements whose compounds formed the basis of classification in Mendeleev's periodic table. Why did Mendeleev choose these elements? How the formulae of these compounds had helped Mendeleev in deciding the position of an element in his periodic table?
Given the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is . According to the criteria, in which group and period it should be placed?
