The principal quantum number (n) is a positive integer with values 1,2,3... For

Question

The principal quantum number (n) is a positive integer with values 1,2,3...

For a given n, Azimuthal quantum number (l) may have the values 0 and all positive integers upto n-1.

For a given l, the values of Magnetic quantum number (ml) ranges from +l through 0 to -l.

The value of spin quantum number(ms) could be +1/2 or -1/2, depending on whether the electron rotated clockwise or anti clockwise about its axis.

(b) is not an allowable set of quantum number because here l is equal to n.

a) An element of 2nd period and whose outermost electron is in s orbital i.e. of Group 1 or Group 2 : Lithium(Li)

c) An element of 2nd period and whose outermost electron is in p orbital i.e. of Group 13 to Group 18: Boron(B)

d) An element of d block of 5th period: Palladium(Pd)

Explanation / Answer

Which of the following is not an allowable set of quantum numbers? Explain your answer briefly. For those sets that are valid, identify an element in which an outermost valence electron could have that set of quantum numbers. ine 0 71 (a) 2 (b) 1 (c) 2 (d) 4 nm, 2 +2 Answer the questions below about the elements A and B, which have the electron configurations shown.

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