Answer the questions based on Modern Periodic table. Use your bra… - Vidyadip

Question

Answer the questions based on Modern Periodic table.
Use your brain power;

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

Question
(i) By referring to the Modern Periodic table find out the period to which the above elements belong?
(ii) Arrange the above elements in a decreasing order of their atomic radii.
(iii) Does this arrangement match with the pattern of the second 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) Elements O, B, C, N, Be, Li belong to period 2.
(ii)

Element	Li	Be	B	C	N	O
Atomic radii	152	111	88	77	74	66

(iii) Yes. As we move from left to right with in a period the atomic number increases one by one, meaning the positive charge on the nucleus increases by one unit at a time, but the electrons are added to the same orbit thereby increasing the pull towards the nucleus which decreases the size of the atom.
(iv) Li has the biggest atom and O has the smallest atom.
(v) Atomic radius decreases from left to right within a period.

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