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# Atomic Mass

## Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.

###### 1,746 Questions

Should you use atomic number or atomic mass number for electronic configuration?

You should use atomic number for electronic configuration. Atomic number represents the number of protons in an atom, which determines the element's identity and the number of electrons it typically has. Atomic mass number is the sum of protons and neutrons, which is useful for determining the mass of an atom but not for electronic configuration.

How do scientists determine the atomic mass of an atom?

Scientists determine the atomic mass of an atom by averaging the masses of all the isotopes of that element, weighted by their abundances. This information can be obtained from mass spectrometry data and is used to calculate the weighted average mass. The atomic mass is typically reported in atomic mass units (amu).

What were the benefits of developing the measurement atomic mass unit?

Developing the atomic mass unit allowed for a standardized method of measuring atomic masses, providing a more precise and consistent way to compare the masses of different atoms. This was crucial for advancements in chemistry and physics, leading to a better understanding of atomic structures and the development of the periodic table.

What is the atomic mass number of krypton?

83.98 amu is the Atomic Mass, 36 is the atomic number.

What unit is used to meause weighted average atomic mass?

The unit used to measure weighted average atomic mass is atomic mass unit (amu). This unit is a standard for atomic and molecular mass measurements in chemistry and is defined as one twelfth of the mass of an atom of carbon-12.

What caused the atomic age?

The atomic age was primarily caused by the development and use of nuclear weapons, starting with the atomic bombings of Hiroshima and Nagasaki in 1945. The Manhattan Project, a research and development program during World War II, led to the creation of the first atomic bombs, marking the beginning of the atomic age.

What is the atomic mass of krypton 92?

The atomic mass of krypton-92 is approximately 91.91 grams per mole.

How many atoms are in 1 atomic mass unit of hydrogen?

Atomic mass unit is a unit of mass for all chemical elements, not only for hydrogen.

The atomic weight of hydrogen is [1,00784; 1,00811]; the conventional atomic weight is 1,008.

1 atom is equal to 1 amu.

Why does 10 gram of nitrogen gas contain the same number of molecules as 10 gram of carbonmonoxide?

Both nitrogen gas and carbon monoxide have the same molecular weight, around 28 grams per mole. Therefore, 10 grams of each substance contain approximately one-third of a mole of molecules. Since Avogadro's number (6.022 x 10^23) represents the number of molecules in one mole of a substance, both 10 grams of nitrogen gas and 10 grams of carbon monoxide contain the same number of molecules, which is roughly 2 x 10^23.

What element has a 27 atomic mass?

The element with an atomic mass of 27 is cobalt (Co). Cobalt is a transition metal found in the periodic table with atomic number 27.

What is the atomic mass of the isotopes of clorine?

The atomic mass of the isotopes of chlorine are as follows:

• Chlorine-35 has an atomic mass of approximately 35.5 amu
• Chlorine-37 has an atomic mass of approximately 37.5 amu.

Why was basis of classification of element in the periodic table changed from atomic mass to atomic number?

The basis of classification was changed from atomic mass to atomic number because atomic number (the number of protons in the nucleus) is a more fundamental property of an element than atomic mass. It led to a more accurate arrangement of elements in the periodic table and helped to explain periodic trends and properties in a clearer manner. Additionally, it resolved anomalies like the incorrect order of certain elements based on atomic mass.

How you determined the relative atomic mass of oxygen?

The relative atomic mass of oxygen is determined by taking the weighted average of the isotopic masses of its naturally occurring isotopes (O-16, O-17, O-18) in respect to their abundance in nature. This calculation gives an average value close to 16, which is the standard atomic mass unit for oxygen.

Do carbon and oxygen have the same atomic mass?

No, carbon and oxygen do not have the same atomic mass. Carbon has an atomic mass of approximately 12 atomic mass units, while oxygen has an atomic mass of approximately 16 atomic mass units.

Can one use the average mass of elemental bromine for the atomic mass of bromine?

No, the average mass of elemental bromine includes isotopes of different masses. The atomic mass of bromine on the periodic table is a weighted average of the isotopic masses of bromine's isotopes.

What atom has an atomic mass of 3?

The atom with an atomic mass of 3 is lithium. It has 3 protons and usually 3 neutrons in its nucleus, giving it an atomic mass of 3.

What are atoms with same atomic mass but different atomic numbers called?

Atoms with the same atomic mass but different atomic numbers are called isotopes. Isotopes have the same number of protons but different numbers of neutrons in their nucleus, which results in differences in atomic number.

What does the atomic mass or mass number tell you about an atom?

As a first approximation it tells us simply the total number of protons and neutrons in the nucleus. The electrons and binding energy of the nucleus contribute a very much smaller amount to the mass.

Since the number of protons in a given element is constant (the atomic number), we can also tell the number of neutrons in an atom by subtracting the atomic number from the atomic mass (approximately).

Since different isotopes of each element have different numbers of neutrons (but the same number of protons), they will have different atomic masses. The given atomic weight for a particular element is usually based on the relative abundance of the isotopes as they occur in nature.

It is also true that elements with very high elemental weights tend to be unstable, that is, radioactive.

(Referring to the Wikipedia entry on "atomic mass" I see that what I have defined here may include some of the sense of "atomic weight", however the difference is subtle. See that entry for further clarification.)

What particle makes up an atoms atomic mass?

Protons and neutrons make up an atom's atomic mass. Protons have a positive charge and are found in the nucleus along with neutrons, which have no charge. Electrons, which have a negative charge, contribute very little to the atomic mass of an atom.

Does 7Be and 7 Li have the same atomic mass?

No, 7Be and 7Li do not have the same atomic mass. 7Be has an atomic mass of approximately 7 atomic mass units (amu) while 7Li has an atomic mass of approximately 7 atomic mass units.

Is there any relationship between atomic mass and number of proteins and electrons?

Yes, there is a relationship between atomic mass and the number of protons and neutrons in an atom. The atomic mass is approximately equal to the sum of the number of protons and neutrons in an atom, as electrons have negligible mass compared to protons and neutrons. The number of electrons in a neutral atom is equal to the number of protons, in order to maintain a balanced charge.

If an element has an atomic number of 45 and an atomic mass of 92 the number of protons it has is?

The atomic number always gives the number of protons or electrons.

The neutrons are obtained by subtracting the number of protons from the atomic mass.

In this example, since 45 is the atomic number, this element has 45 protons. since the mass is 92, the number of neutrons is 92-45= 47.

However, this is not really true because the element with 45 as atomic number is rhodium and it has a mass of 103 u and hence a total of 58 neutrons.

What is the atomic mass unit of protons and neutrons?

The atomic mass unit of protons and neutrons is approximately 1.67 x 10^-27 kg. This unit is used to express the mass of subatomic particles in atomic physics.

Which is the appropriate atomic mass of an atom with 16 neutrons?