Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.

Give the electronic configurations and oxidation states of group 17 elements.

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

Carbon (atomic number 6) and silicon(atomic number 14) are elements in the same group of the periodic table give the electronic arrangemetns of the carbon and silicon atoms and state the groups in which these elements occur.

Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Write the names and symbols of two most reactive metals belongiong to group I of the periodic table. Explain by drawing electronic structure how either one of the two metals reacts with halogen. With which name is the bond formed between these elements known and what is the class of the compuond so formed known? state any four physical properties of such compounds.

An element has the electronic configuration 2,8,8,2 indicate its group and period in the modern periodic table?