Question

40 20 ca
enter your answers numerically separated by a comma.

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number of protons, number of neutrons =
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part b
228 88 ra
enter your answers numerically separated by a comma.

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number of protons, number of neutrons =

Explanation:

Step1: Identify proton number

The bottom - number is proton number. For $_{20}^{40}Ca$, protons = 20. For $_{88}^{228}Ra$, protons = 88.

Step2: Calculate neutron number

Neutrons = mass number - proton number. For $_{20}^{40}Ca$, neutrons = 40 - 20 = 20. For $_{88}^{228}Ra$, neutrons = 228 - 88 = 140.

Answer:

20,20
88,140