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How many electrons does boron-50 have?
12
12
8
5
4
40
5
11
How many neutrons does magnesium have?
12
12
8
5
4
40
5
11
How many protons does boron-15 have?
12
12
8
5
4
40
5
11
What is the mass number of beryllium?
12
12
8
5
4
40
5
11
How many electrons does beryllium have?
12
12
8
5
4
40
5
11
What is the atomic number of sodium?
12
12
8
5
4
40
5
11
What is the mass number of potassium-40?
12
12
8
5
4
40
5
11
What is the mass number of carbon?
12
12
8
5
4
40
5
11
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