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igor_vitrenko [27]
3 years ago
6

What is the mass number of sodium

Chemistry
2 answers:
lina2011 [118]3 years ago
3 0

Answer:

Explanation:

Sodium mass number 23, 11 electrons

Magnesium: neutrons = 12

aluminum : atomic number  = 13

phosporus : protons = 15

Pavlova-9 [17]3 years ago
3 0

Answer:

23

Explanation:

You need to add protons and neutrons to get mass

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