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प्रश्न
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
उत्तर
The electrons present in the last shell determine the valency of a particular element.
If, Number of valence electrons ≤4: valency = number of valence electrons Number of valence electrons >4: valency = 8 - number of valence electrons
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संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine
Name the element which is in seventeenth group and second period.
The electronic configuration of the atom of an element X is 2, 8, 4. In modern periodic table, the element X is places in :
(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Arrange the following in increasing order of property indicated
SiO2, P2O5, SO3, Cl2O7 (acidic nature)
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
Fill in the blanks from the words A to F given below.
A: Decreases
B: Increases
C: Remains same
D: Increases by one
E: Electropositive
F: Electronegative
Down a group in the Modern Periodic Table.
No. of electron shells __________; No. of valence electrons ________; Electronegativity ________ Character of elements changes from _________ to ____________.
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
