What is the atomic number of sodium?

How many neutrons does magnesium have?

How many electrons does beryllium have?

What is the mass number of carbon?

What is the mass number of potassium-40?

How many protons does boron-15 have?

How many netrons does boron-15 have?

How many electrons does boron-50 have?

What is the mass number of beryllium?

How many neutrons are in beryllium-10?

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