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the answer is 109... im not positive that im right but if i am right heres what you do... subtract the Atomic Mass from the atomic number(number of protons.) :p

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14y ago
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14y ago

106 neutrons. Since you minus the number of protons which is the atomic number and the mass number which is the neutrons and protons added together.

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11y ago

72 protons

72 electrons

108 neutrons

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Q: How many neutrons has Hafnium if its atomic number is 72 and its mass number is 178?
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How many neutrons does hafnium have?

* Number of Electrons: 72 * Number of Neutrons:106 * Number of Protons: 72 * Number of Electrons: 72 * Number of Neutrons: 106 * Number of Protons: 72


How many neutons are in hafnium?

the atomic number of hafnium is 72, protons? 72, neutrons? 106, electrons? 72


How many valence electrons does hafnium have?

Hafnium has 72 electrons and protons; the number of neutrons is different for each isotope and depend on atomic mass of the isotope.


How many protons does Hafnium 138 with a plus 2 charge have?

The atomic number of hafnium is 72. So there is 72 protons.


Atomic number of 2 and atomic mass of 4 how many neutrons?

To find the number of neutrons simply subtract the atomic number from the atomic mass. In this case there are two neutrons.


How many neutrons in californium?

Number of neutrons = Atomic mass of an isotope - atomic number Atomic number of Cf is 98.


How many neutrons dose hassium have?

Number of neutrons = Atomic mass of an isotope - Atomic number of the element The atomic number of hassium is 108; each isotope of an element has a different number of neutrons and a different atomic mass.


How many neutrons does a cesium 141 have?

The atomic number of cesium is 55. The number of neutrons is the isotope mass number minus atomic number, or in this instance 86 neutrons.


How many neutrons are does yttrium have with an atomic number of 39 and atomic mass of 89?

50 neutrons


How many neutrons are in an atom with the mass number being 186?

The atomic number (number of protons) of the element is needed to tell the number of neutrons. Mass number = atomic number + number of neutrons.


How many neutrons are in roentgenium?

Roentgenium-272 has 161 neutrons. Number of neutrons = Atomic mass of an isotope - Atomic number of the element The atomic number of roentgenium is 111, but Rg has many isotopes each with a different atomic mass and number of electrons.


How do you find out how many neutrons a atom has?

Mass number = Atomic number (or number of protons) + Number of neutrons