Chemistry
Elements of group 1 and elements of group 17 both have valency 1. Explain.
Periodic Table
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Answer
Valency is equal to the number of electrons an atom can donate or accept or share. Hence, it depends on the number of electrons in the outermost shell (i.e. valence shell).
Group 1 (IA) elements have one electron in their outermost shell. So they donate this one electron to become stable hence their valency is one. On the other hand, Group 17 (VIIA) elements have seven electrons in their outermost shell. So they accept one electron to attain stable electronic configuration hence their valency is also one.
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Related Questions
How does the electronic configuration in atoms change
(i) in a period from left to right?
(ii) in a group from top to bottom?
Name two elements in each case :
(i) Alkali metals
(ii) Alkaline earth metals
(iii) Halogens
(iv) Inert Gas
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.
What do you understand by ?
(i) Periodicity
(ii) Typical elements
(iii) Orbits