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The formula is Atomic Mass (rounded to the nearest whole number) minus the Atomic Number.

This works because Protons and Neutrons have virtually the same mass, and electrons virtually none. As well as the Atomic Number being equal to the amount of Protons.

Essentially:

Protons + Neutrons - Protons = Neutrons. Basic Prealgebra.

So to find the amount of Neutrons in Erbium:

Erbium's Atomic Mass rounded (167) - Erbium's Atomic Number (68) = approx. 99 Neutrons

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13y ago
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11y ago

For the isotope, Er-167, there are 99 neutrons as the atomic number of erbium is 68.

Note: mass number = number of protons + number of neutrons

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14y ago

i think its 6...

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14y ago

68, the same number as its atomic number

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14y ago

See link below.

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13y ago

2

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11y ago

2

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Q: How many different isotopes of erbium are there?
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Related questions

Is erbium radioactive?

All erbium ordinarily found in nature is of stable isotopes. Like all other elements, erbium has synthetic radioactive isotopes.


What radioactive isotope has 68 protons and 31 neutrons?

Element #68 is Erbium. The number of the isotope, of course, is the sum of the protons + neutrons. Checking the Wikipedia article "Isotopes of erbium", it looks as if this isotope doesn't actually exists.


How many neutrons does Ar element have?

That depends on the isotope, as Argon has three different stable isotopes and many different radioactive isotopes.


How many electrons does erbium have?

ya mom


How many electrons are in the outer shell of erbium?

Two.


Atoms of same chemical element that have different atomic mass are known as?

Isotopes. They differ in the number of neutrons in the nucleus.


What is the atomic number of Ar?

That depends on the isotope, as Argon has three different stable isotopes and many different radioactive isotopes.


What is hydrogen plus erbium?

hydrogen plus erbium


What is the name for atoms of an element that have different masses?

An atom or element that have different masses are known as isotopes.


How many chlorine has isotopes?

Chlorine has a lot of different isotopes but the 2 stable ones are chlorine 35 and chlorine 37


Which elements have different isotopes?

Many elements have different isotopes: 1) Carbon - Carbon 12, Carbon 14 2) Hydrogen - Protium, Deuterium, Tritium 3) Chlorine - Chlorine 35, Chlorine 37 etc


What are the Names of 15 different isotopes and their application?

what are the names of 15 different isotopes