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प्रश्न
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
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उत्तर
In period 1 the number of electron shells is [1] In period 2 is [2], in period 3 is [3]
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संबंधित प्रश्न
Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
Differentiate between Normal elements and Transition elements.
Name the element which is in first group and third period.
Periodicity is observed due to the similar ______.
What is modern periodic law?
An element A has 2 electrons in its fourth shell. State:
its valency
Fill in the blank and rewrite the completed statement:
________ group in the periodic table contains elements that are all gases at room temperature.
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
State the following:
The group which contains highly electropositive metals including sodium.
