Which element has a valency 1?

Which element has smallest size?

Analyse the given subshell electronic configurations and answer the questions (Symbols are not real) A - [Ne] 3s^2 3p^2 B - [Ne] 3s^2 C - [Ar] 4s^1 D - [Ar] 4s^2 3d^2 a. Which element has higher electronegativity? b. Which element shows various oxidation states? c. Write the total number of p electrons in the element C. d. Which element has ionization energy?

Which element is having 5 electrons in valence shell?

Which element has the highest ionisation energy?

The figure of an incomplete periodic table is given below. Which element has the highest atomic radius ? Which one has the least ?

Which element has the highest electronega-tivity in 17th group?

An incomplete form of the periodic table Is given below.(symbols are not real) Which element has the highest Ionisation energy?

1.00 g of a chloride of an element contains 0.835 g of chlorine. If the vapour density of the chloride is 85, find the atomic weight of the element and its valency.