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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
How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table?
Consider two elements 'A' (Atomic number 17) and 'B' (Atomic number 19) :
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed when 'A' combines with 'B.'
(iii) Draw the electron dot structure of the compound and state the nature of the bond formed between the two elements.
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
Complete the following sentences.
The properties of the elements are a periodic function of their …………… (atomic number, mass number, reative atomic mass).
Select the correct answer
Identify the metalloid
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)
Name and state the following with reference to the elements of the first three periods of the periodic table.
Metalloid in Period 3.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
