O,S,Se,Te are called_____elements.

Elements O, S, Se and Te are usually known as____.

Elements O, S, Se and Te are usually known as____.

Arrange the following groups of substances in the order of the property indicated against each group: O,S,Se,Te- increasing order of electron gain enthalpy.

Elements O,S,Se and Te are commonly known as

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.