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30. If quantu...

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30. If quantum number of element are given such as n,l,m,s then how to find period and group of element.

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Q. If the quantum numbers of the highest energy electron in an atom of an element are given as:

n = 4, l = 3, m = + 3, s = + \frac{1}{2}

then the element belongs to:

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

Q. The atomic numbers of three elements A, B and C are given below:

Element	Atomic number
A	5
B	7
C	10

(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?

Q. If A has 5 elements and B has 8 elements such that

A \subset B,

then the number of elements in

A \cap B,

A \cup B,

are respectively :

Q. There are two elements

x, y

(G, *

) such that every element in the group can be written as a product of some number of

x

y

's in some order. It is known that

x * x = y * y = x * y * x * y = y * x * y * x = e

e

is the identity element. The maximum number of elements in such a group is

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