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poizon [28]
3 years ago
14

Which atoms have the same number of neutrons?

Chemistry
1 answer:
german3 years ago
6 0

Answer:

4. H-3 and He-4

Explanation:

H-3 means hydrogen with a mass number of 3. Mass number is the addition of protons and neutrons in the nucleus. Hydrogen always has 1 proton because it has atomic number 1, therefore the number of neutrons is found by subtracting 1 from the mass number (3).

3-1= 2 neutrons

He-4 also has 2 neutrons. He-4 has mass number 4, which means that its protons and neutrons added together equals 4. Helium has 2 protons because it has atomic number 2.

Therefore 2 + neutrons =4

neutrons =4-2

neutrons =2

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