Taking first period and 17 th group of the periodic table, write gradation of properties with respect to the following: a) atomic size b) Ionisation energy c) electro positivity and electro negativity.

Taking first period and 17 th group of the periodic table, write gradation of properties

with respect to the following: a) atomic size b) Ionisation energy c) electro positivity

and electro negativity.
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1 Answer

Answer :

The elements of 1 st period are hydrogen and helium.

a) Atomic size of hydrogen is larger then that of helium because atomic size decreases

across a period.

b) Ionisation energy of helium is larger than that of hydrogenbecause ionisation increases

across a period.

c) Electro positivity of hydrogen is higher than that of helium because it decreases across

the period. Electro negativity of helium is higher than that of hydrogen becauses it

increases across the period.

The elements of 17 th group are Fluorine, Chlorine, Bromine, Iodine and Astatine.

a) Atomic size of Astatine is larger because it increases down the group.

b) Ionisation energy of Fluorine is higher because it decreases down the group.

c) Electro positivity of Astatine is higher as it increases down the group. Electro negativity

of fluorine as it decreases down the group.
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