Question

An atom of hydrogen gains one electron to form hydride ion. In the formation of hydride ion, (1) Is hydrogen oxidised or reduced? (2) To which noble gas does the electronic configuration resemble? (3) What is the charge on hydride ion?

Answer 1

H + 1e^-1 -------> H^-1 [ Hydride ion ]

Here an atom is gained, hence according to old theory or which we use in organic chemistry. Gain of hydrogen is Reduction. Loss of hydrogen is Oxidation. 

1) Here H atom converted to H- ion [ hydride ion ]. Hence, Hydrogen is Reduced. 

2) Here hydride ion has 2 electrons. Hence, it resembles electronic configuration of Helium, A noble gas. 

3) The charge on hydride ion is " - " 

Hope helped! ^^

Answer 2

Hi friend,

Your answer:

1) The old theory says that atoms gaining electrons are said to be reduced. As the H atom has gained an electron,so, Hydrogen is said to be Reduced. 

2) The hydride ion, so formed, has an electronic configuration which resembles that of Helium. 

3) The charge on the hydride ion is negative.

Hope it helps!