Is it possible to have an elements with atomic number 1.5 placed between hydrogen and helium?

Is it possible to have a polyhedron with any given number of faces?

Write all possible oxidation states of an element having atomic number 25.

An element with atomic number 20 will be placed in which period of the perodic table ?

Write the highest oxidation state of element with atomic number 23.

The atomic number of an element X is 20 while the atomic number of an element Y is 24.What is the nature of the bond formed between X and Y?Give the electron-dot structure of the compound formed.

Write the electronic configuration of the element with atomic number 102?