(a) As element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
(b) The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
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Answer: The element X is Zirconium (Atomic mass. 40) It belongs to the 4th group in the modern periodic table.
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Let us solve this problem and suggest the element
Explanation:
(a) Mass number of element X =40
Number of neutrons =21
The group to which it belongs : For this let us find protons .
Mass number =protons + neutrons
40=P-21
Protons =19
The configuration is 2,8,8,1
It is identified as Potassium and it belongs to group 1
b) The element X forms a compound X₂Y . The Y belongs to group 16 as its valency is -2 so, it can be O.
That is : K₂O
Potassium oxide
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