Question

5. Name two elements in each case :
(i) Alkali metals
(ii) Alkaline earth metals
(iii) Halogens
(iv) Inert gas
6. Elements of group 1 and elements of group 17 both
have valency 1. Explain.
7. Correct the statements.
(i) Elements in the same period have the same
valency.
(ii) Valency depends upon the number of shells in an
atom.
(iii) Copper and zinc are representative elements.
(iv) Transition elements are placed at extreme right of
the periodic table.
8. What do you understand by ?
(i) Periodicity (ii) Typical elements
(iii) Orbits​

Answer 1

Answer:

Answer :

5 :

i) Lithium and Sodium

ii) beryllium and magnesium

iii) chlorine and fluorine

iv) argon and neon

6 :

This is because elements in group 1 and group 17 accept same number of electrons to attain stable electronic configuration .

7 :

i) elements and same period have same electronic shells .

ii) valency depends on the number of electrons present in the outermost shell.

iii) helium and lithium are representative elements .

iv) transitional elements are present in middle of periodic table.

8 :

i) Periodicity : the repetition of elements after regular interval of time .

ii) typical elements : The elements which have fixed oxidation states in the periodic table are classified as typical elements.

iii) orbit : it is a shell in which electrons revolve around the nucleus of an atom .

Explanation:

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