Question

Which of the following groups form electron rich hydrides (i) Chalcogens (ii) alkali metals (iii) noble gases (iv) alkali earth metals

Answer 1

transtition metals and atoms have valence electrons in d subshell

Answer 2

(i) Chalcogens form electron rich hydrides.

• The term electron rich hydrides means that the hydride compounds are rich in electrons or have excess electrons.
• These electrons are present in the form of lone pairs.
• From the periodic table, group 15, 16 and 17 can form electron rich hydrides.
• Common example of hydride is water. In the molecule of water, oxygen has two lone pair of electrons.