2nd Year Chemistry Chapter 1 Important Short Questions

Here we have written Important short questions of chapter 1 Periodic Classification of Elements and Periodicity 2nd-year chemistry Chapter 01 Ql Lanthanide contraction controls the atomic size of the elements of the 6th and the 7t period? Ans: Lanthanides are present in the 6th period and actinides are the members of 7th periods. In case of Lanthanides and actinides, the valence electrons are