(An element A has an atomic number 11.
(a) Represent its electronic configuration.
(b) to which group of periodic table, does it belong?
(c) What is its valency?
(d) write the formula of its write the formula of its oxide.
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a) Configuration of X(19)=2,8,8,1.
b) It belongs to fourth period and its valency is 1.
c) Basic oxide (X2O)
d) X 2 O+H 2 O→2XOH
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