A nucleus $A$ has $86$ protons and $128$ neutrons. What is the mass number of the nucleus $A$ ?

128

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210

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214

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212

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Solution

The correct option is B $214$
Total number of nucleons =Number of protons+number of neutrons $= 86 + 128 = 214$ .

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An atomic nucleus A is composed of 84 protons and 128 neutrons.

The atomic nucleus A emits an alpha particle and is transformed into nucleus B. The atomic nucleus B emits a $β$ - particle and is transformed into a nucleus C. What is the composition of atomic nucleus C?

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_{84}^{128} A

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A nucleus A has 86 protons and 128 neutrons. What is the mass number of the nucleus A?

The correct option is B 214Total number of nucleons =Number of protons+number of neutrons =86+128=214.

A nucleus $A$ has $86$ protons and $128$ neutrons. What is the mass number of the nucleus $A$ ?

The correct option is B $214$
Total number of nucleons =Number of protons+number of neutrons $= 86 + 128 = 214$ .