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Question

Two elements X and Y need to be arranged in Mendeleev's periodic table. X has 3 protons more ​​​​​than Y but their neutrons are equal in number. Which of the following is correct about X and Y?


A

X will be placed after Y

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B

Atomic mass of X is less than Y.

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C

X and Y are isotopes

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D

Y will be placed after X

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Solution

The correct option is A

X will be placed after Y


In Mendeleev's periodic table, elements are arranged according to increasing atomic mass. Now since neutrons and protons are responsible for the atomic mass of an atom, so X will be placed after Y.


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