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P-1 Periodic Classification of Element — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Periodic Classification of Element5 Marks
Question
Answer the questions based on Modern Periodic table.
(i) Go through the Modern Periodic table (fig 2.1) and write the names one below the other of the elements of group 1.
(ii) Write the electronic configuration of the first four elements in this group.
(iii) What similarity do you find in their electronic configuration?
(iv) How many valence electrons are there in each of these elements?
✓

Answer

(i) H
Li
Na
K
Rb
Cs
Fr are the elements of group 1.
(ii)
ElementAtomic No.Electronic configuration
KLMN
H11   
Li321  
Na11281 
K192881

(iii) The outermost shell contains one electron in all these elements.
(iv) Number of valence electrons in each of the elements is 1.

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