Question

The atomic number of boron is 5. what is the mass number of a boron atom with 4 neutrons?

Answer 1

neutrons = atomic mass -protons (atomic number), so the answer is 9

Answer 2

The mass number of a boron atom with 4 neutrons is "9".

Given:

• Atomic number of boron = 4
• Number of neurons = 4

As we know the formula,

→ $Number \ of \ neurons = Mass \ number -Atomic \ numbe$

or,

→ $Mass \ number =Number \ of \ neurons +Atomic \ number$\

By substituting the given values, we get

→                        $= 4+5$

→                        $= 9$  

Thus the above answer is correct.

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