Disha Expert Team Solutions for Chapter: Classification of Elements and Periodicity in Properties, Exercise 1: EXERCISE

Which one of the following elements exhibit maximum number of valence electrons?

Which of the following elements does not lose an electron easily?

To which block is related an element having an $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$ electronic configuration in the periodic table _____.

If the valence shell electronic configuration for an element is $n{s}^{2}n{p}^5,$ this element will belong to the group of _____.

Which shows variable valency _____.

The noble gases are unreactive because _____.

Which scientist came up with the concept of a periodic table that included all of the known elements?

If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is _____.