74. How to assign the appropriate group and period to an element whose atomic number is given to us

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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?

There is an element X with atomic number 16. A student was assigned a task to write down the features of the group to which this element belongs to. Help him find the group number of the element X so that he can complete his task.

There is an element X with atomic number 16. A student was assigned a task to write down the features of the group to which this element belongs to. Help him to find out the group number of the element X so that he can complete his task.

Q. An element belongs to group IA and 3rd period in the periodic table. Find an atomic number of that element. Find the atomic number of elements that are placed just
A) below

B) above to the given element in the periodic table.

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?

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