4. The electronic configuration of an element 'x' is 2.8.8, 1.
To which (a) period and b group of the moderm periodic
table does x belong? State its valency. Justify your
answer in each care.
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4
Answer:
The atomic number of the given element is 19.
This the element is potassium
a) It belongs to 4th period
b) It belongs to 1st group
It's valency is 1
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Answer: The element X has it's atomic number 19. So, the element is Potassium (K). It belongs to group 1 and period 4 in the modern periodic table. Potassium only has one electron in its outermost shell since it is less than 4 the valency of Potassium is equal to 1.
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