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The mass number is the sum of protons and neutrons in the atomic nucleus of chemical elements. All mass numbers are integers.

The atomic weight is not an an integer because is calculated taking in the account the isotopic composition of an element; also the mass excess has a role.

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12y ago
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3mo ago

The Atomic Mass number of oxygen has a decimal value because it accounts for the presence of different isotopes of oxygen in nature. Oxygen has three naturally occurring isotopes: oxygen-16, oxygen-17, and oxygen-18, each with a different mass. The atomic mass number is a weighted average of the masses of these isotopes, leading to a decimal value.

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Q: Why do atomic mass numbers have decimals for oxygen?
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What are the atomic and mass numbers of oxygen?

The mass number is the sum of neutrons and protons in the atomic nucleus and is different for each isotope of any element. For example the isotope oxygen-16 has the mass number 16. The atomic weight of oxygen (not atomic mass) is [15,99903; 15,99977] after the IUPAC Tables - 2009. The atomic number of oxygen is 8.


What is the atomic mass of o?

The atomic mass of oxygen (O) is approximately 16 atomic mass units.


What is the oxygen mass number?

The atomic weight (not mass) of oxygen is [15,99903; 15,99977] or in an abridged form 15,999. The term atomic mass is used only for isotopes. The mass number is the sum of neutrons and protons in an atomic nucleus.


If the atomic mass of oxygen?

Oxygen is a metal element. Atomic mass of it is 16.


What is the atomic mass of Hydrogen Nitrogen and oxygen?

The atomic mass of hydrogen is approximately 1 atomic mass unit, the atomic mass of nitrogen is approximately 14 atomic mass units, and the atomic mass of oxygen is approximately 16 atomic mass units.


What is the approximate mass of an oxygen atom in atomic mass units?

The approximate mass of an oxygen atom in atomic mass units is 16. Oxygen has an atomic number of 8, which means that its atomic mass is approximately 16 atomic mass units.


Rounded off atomic mass of oxygen?

The rounded atomic mass of oxygen is 16.00 amu (atomic mass units).


What is oxygen in atomic mass?

The atomic mass of oxygen is approximately 16.00 atomic mass units.


Which element has an atomic mass of 16.00?

the element that has an atomic mass of 16.00 is sulfer.


What the atomic mass in oxygen?

Oxygen is a non metal element. Atomic mass of it is 16.


What is the atomic number and atomic mass for oxygen?

Oxygen is a non meta element. Atomic mass of it is 16 Atomic number of it is 8.


What is the atomic mass of an oxygen atom?

The atomic mass of an oxygen atom is approximately 16 atomic mass units. It is determined by the sum of the protons and neutrons in the nucleus of the atom.