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Question

On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

(a)  increases                                                                                     (b)  decreases

(c) remains the same                                                                     (c)   first increases then decreases


Solution

(b) Decreases.


The size of the atom decreases on moving from left to right in a period of the periodic table. With an increment in the atomic number, both the proton number and the nuclear positive charge increase. As the nucleus attracts the outermost electron, the size of the atom decreases.


Chemistry
Science for Tenth Class - Part II - Chemistry
Standard X

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