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Because electrons, which are gained or lost to form ions from atoms, have so little mass compared with protons or neutrons that the electrons are ignored in the mass number.

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Q: Why is the mass number of the ion the same as the number of isotope?
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How do you decide a element is a isotope or ion?

An isotope has a different number of neutrons and therefore a different atomic mass. An ion has a different number of electrons from protons and therefore carries an electric charge


What do you call unequal number of protons and electrons?

All atoms have the same number of protons and electrons, but an atom with a different number of protons and neutrons is called and isotope


What is the difference between an ion and an isotope?

an ion has a different number of electrons and an isotope has a different number of neutrons then listed on the Periodic Table or your sample


What is the difference between an isotope and an ion of the same element?

The isotopes of a given element, such as oxygen-16 and oxygen-18 have the same number of protons in their nuclei, but different numbers of neutrons, and therefore different mass numbers. Oxygen-16 has 8 protons (its atomic number) and 8 neutrons, while oxygen-18 has 8 protons and 10 neutrons. As long as they are neutral atoms, they also both have 8 electrons. An ion is an atom of an element, that has lost or gained one or more electrons, developing a positive or negative charge. When an oxygen atom ionizes, it gains two electrons, forming an oxide ion with a charge of 2-. The oxide ion would still have the same number of protons (8 for all oxygen atoms and ions), and it would have the same number of neutrons as the isotope that became the ion, so it would have the same mass number as the particular oxygen isotope that gained the two electrons, but the number of electrons would not equal the number of protons as it would in a neutral atom.


How many protons are in the nucleus of the isotope H-2?

Every atom, ion, and isotope of the same element will have the same number of protons. Hydrogen has one proton.

Related questions

What do an atom ion and isotope of an ion have in common?

they all have the same element with the same number


What is the symbol for chlorine ion?

37, as the isotope is identified by its mass number.


How do you decide a element is a isotope or ion?

An isotope has a different number of neutrons and therefore a different atomic mass. An ion has a different number of electrons from protons and therefore carries an electric charge


How is a fluorine isotope different from a fluorine ion how are they the same?

The fluorine isotope differs from the fluorine ion because the fluorine isotope has a different number of neutrons from normal, while the ion has a different number of electrons. An isotope will have the same number of electrons as its atomic number (the number of protons), while the ion will add (more common in the case of fluorine) or subtract (very rare in the case of fluorine) electrons to the atom. The only thing they are similar in is the number of protons they have, which are the same.


What do you call unequal number of protons and electrons?

All atoms have the same number of protons and electrons, but an atom with a different number of protons and neutrons is called and isotope


What is the mass number of the ion?

The mass number of an ion remains the same as the element. This is because an ion gains or loses electrons which have minimal mass.


How many neutrons does a negative oxygen ion have?

8. When an atom becomes an ion, it gains or loses electrons. The number of protons and neutrons doesn't change. If the number of neutrons changes then the atom has changed into a different isotope.


What is the difference between an ion and an isotope?

an ion has a different number of electrons and an isotope has a different number of neutrons then listed on the Periodic Table or your sample


Are ions charged and isotopes are not?

An ion is an atom with gained electrons (anion) or which losses electrons (cation). An isotope of an element is an atom with a different number of neutrons but with the same number of protons and electrons. As any other atoms the atom of an isotope can gain or loss electrons.


What is the difference between an isotope and an ion of the same element?

The isotopes of a given element, such as oxygen-16 and oxygen-18 have the same number of protons in their nuclei, but different numbers of neutrons, and therefore different mass numbers. Oxygen-16 has 8 protons (its atomic number) and 8 neutrons, while oxygen-18 has 8 protons and 10 neutrons. As long as they are neutral atoms, they also both have 8 electrons. An ion is an atom of an element, that has lost or gained one or more electrons, developing a positive or negative charge. When an oxygen atom ionizes, it gains two electrons, forming an oxide ion with a charge of 2-. The oxide ion would still have the same number of protons (8 for all oxygen atoms and ions), and it would have the same number of neutrons as the isotope that became the ion, so it would have the same mass number as the particular oxygen isotope that gained the two electrons, but the number of electrons would not equal the number of protons as it would in a neutral atom.


How many protons are in the nucleus of the isotope H-2?

Every atom, ion, and isotope of the same element will have the same number of protons. Hydrogen has one proton.


Is an atom of an element with a different number of neutrons called ion or isotope?

ion