The elements of the second period of Modern Periodic Table along with
their atomic number are given below.
B (5), Be (4), O (8), N (7), Li (3), C (6), F (9)
(a) Arrange these elements in the same order as they are in the periodic
table.
(b) Which element has the (i) largest and (ii) smallest atom?
(c) Why does the atomic radius change as we move from left to right
across a period?
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The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.
...
Period 2 element.
Hydrogen Rubidium
Strontium
Yttrium
Zirconium
Niobium
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