Taking into consideration the period of the elements given below,… - Vidyadip

Question

Taking into consideration the period of the elements given below, answer the following questions:

Element	Atomic radius (pm)
O	66
B	88
C	77
N	74
Be	111
Li	152

i. Arrange the above elements in a decreasing order of their atomic radii.
ii. State the period to which the above elements belong.
iii. Why this arrangement of elements is similar to the above period of the modern periodic table?
iv. Which of the above elements have the biggest and the smallest atom?
v. What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?

✓

Answer

i. Li > Be > B > C > N > O
ii. All the given elements belong to the second period of the modern periodic table.
iii. The arrangement of the elements matches with the second period of the modern periodic table because the elements were arranged in the decreasing order of their atomic radius.
iv. Lithium (Li) has the biggest atom and oxygen(O) has the smallest atom.
v. Atomic radius decreases while going from left to right within a period.

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