1. Tardigrade
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  3. Chemistry
  4. The number of neutrons in the element 4 Be 9 is :

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Q. The number of neutrons in the element ${ }_{4} Be ^{9}$ is :

ManipalManipal 2002

Solution:

We know that Atomic number = number of protons = number of electrons Mass number = number of proton $ + $ number of neutrons
$\therefore $ number of neutrons = mass number $ - $ atomic number
$=9-4=5 $