Q27 of 69 Page 65

Give the number of electrons in the species and

A positive charged ion denotes the loss of an electron & A negative charged ion represents the gain of an electron by a species.

For H+2:


Number of electrons present in Hydrogen molecule = 2


So, Number of electrons present in H+2 = 2 – 1


= 1


For H2:


Number of electrons present in Hydrogen molecule = 2


For O+2:


Number of electrons present in Oxygen molecule = 8 + 8


= 16


So, Number of electrons present in O+2 = 16 - 1


= 15


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25

An electron is in one of the 3d orbitals. Give the possible values of n, l and ml for this electron.

 26

An atom of an element contains 29 electrons and 35 neutrons. Deduce (i) the number of protons and (ii) the electronic configuration of the element.

 28

(i) An atomic orbital has n = 3. What are the possible values of l and ml?

(ii) List the quantum numbers (ml and l) of electrons for 3d orbital.


(iii) Which of the following orbitals are possible?


1p, 2s, 2p and 3f

 29

Using s, p, d notations, describes the orbital with the following quantum numbers.

(a) n=1, l=0; (b) n = 3; l=1 (c) n = 4; l =2; (d) n=4; l=3.