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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
Give scientific Reason :
Atomic radius goes on decreasing while going from left to right in a period.
✓

Answer

(i) Atomic radius is the distance between the centre of the atom and its outmost shell.
(ii) Atomic radius decreases across a period.
(iii) This is because valence electrons are being added to the same outermost shell or to the same energy level because of which the electrons added experience greater pull from the nucleus.
(iv) This results in the electrons moving closer to the nucleus. Hence, the atomic radius goes on decreasing while going from left to right in a period.

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