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Byju's Answer
Standard XII
Chemistry
Electronic Configuration
Write the nam...
Question
Write the name from the description
The family of metals having valency two
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Solution
The family of metals having valency two =
Alkaline earth metals
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Q.
Write the names from the description.
a. The period with electrons in the shells K, L and M.
b. The group with valency zero.
c. The family of nonmetals having valency one.
d. The family of metals having valency one.
e. The family of metals having valency two.
f. The metalloids in the second and third periods.
g. Nonmetals in the third period.
h. Two elements having valency 4.
Q.
Write down the characteristics of the elements having atomic number 17.
Electronic configuration ____________________________________
Period number ____________________________________
Group number ____________________________________
Element family ____________________________________
No. of valence electrons ____________________________________
Valency ____________________________________
Metal or non-metal ____________________________________.
Q.
(i) Name three elements each whose ions have valency +1,+2 and +3 respectively.
(ii) Name three non-metals/radicals which have valency -1,-2 and -3.
Q.
What is variable valency ? Name two elements having variable valency and state their valencies.
Q.
Metals have electropositive valency and non-metals have electronegative valency.
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