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प्रश्न
Fill in the blank in the following statement:
On moving form right to left in the second period, the number of valency electrons ...............
उत्तर
On moving from right to left in the second period, the number of valence electrons decreases.
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संबंधित प्रश्न
Which element has a total of two shells, with three electrons in its valence shell?
How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?
Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.
Correct the statements.
Elements in the same periods have equal valency.
An element 'M' has atomic number 12.
(a) Write its electronic configuration.
(b) State the group to which 'M' belongs.
(c) Is 'M' a metal or a non-metal.
(d) Write the formula of its chloride.
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (decreasing electronegativity)
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
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
Across a period from left to right in the Modern Periodic Table.
No. of electron shells _________; No. of valence electrons __________: Electronegativity increases Character of elements changes from electropositive to ________.
State the following:
The group which contains highly electropositive metals including sodium.
