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aschulz

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3y ago
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12y ago

The Atomic Mass is 226 (for the isotope 226Ra), and the number of protons is 88. Subtract the atomic mass from the number of protons.

226-88= 138 neutrons.

As a general rule, for all the isotopes of all chemical elements:

Number of neutrons = Atomic mass - Number of protons (Atomic number)

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14y ago

Radium has 88 protons.

Number of neutrons = Atomic mass of an isotope - 88

For example, the best known isotope of radium, 226Ra, has 138 neutrons.

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14y ago

Number of neutrons = Atomic mass of an isotope - 88

For the isotope 226Ra the number of neutrons is 138.

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11y ago

The isotope of radioactive radium with the longest half-life is radium-226. Radium-226 has a mass number of 226 with 88 protons and 138 neutrons.

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14y ago

Radium has 88 protons and 88 electrons.

Number of neutrons = Atomic mass of an isotope - 88

For example, the best known isotope of radium, 226Ra, has 138 neutrons.

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14y ago

Radium has 88 protons and 138 neutrons.

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14y ago

Radium has 88 protons.

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Q: How many protons and neutrons does radium have?
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