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प्रश्न
What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
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उत्तर
The elements at the end of the period have 8 electrons in the valence shell.
Ne = 2, 8
Ar = 2, 8, 8
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संबंधित प्रश्न
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
From the following elements :
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Correct the statements.
Elements in the same periods have equal valency.
State the valency of the elements of periods 3 and write the formula of their oxides.
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
Arrange the following as per instruction given in the bracket.
K, Pb, Ca, Zn (increasing reactivity)
What is meant by a Group in the Periodic Table?
Name or state following with reference to the element of the first three periods of the periodic table.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.
