Science
Atomic Mass

# What is gold's mass number?

The only stable, and only naturally-occurring isotope of gold has mass number of 197. This is the number of protons and neutrons in each nucleus.

Gold's atomic number is 79. This is the number of protons found in each gold atom. This determines its place in the periodic table, and its chemical properties: it is the defining property of gold.

A nucleus with a different number of neutrons and the same 79 protons would be a different isotope with a different mass number; a nucleus with a different number of protons would not be gold, but some other element.

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Chemistry
Periodic Table
Elements and Compounds
Atomic Mass

# What is the mass number of an atom?

A mass number is the total number of protons and neutrons found in an atom.

To find the mass number, you must know the number of neutrons in that particular isotope of the element and then add the atomic number (same as the number of protons) to it.

When this number is definite it is called a nuclide and the symbol is written with a superscript giving the mass number and a subscript giving the atomic number (number of protons) placed in front of atomic symbol: 2311Na. It can also be written after the elements name, sodium-23.

Do not confuse this with the atomic number, which is the number of protons.
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Atomic Mass

# What isotope of carbon has been chosen as the reference isotope for atomic mass units?

carbon 12

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Math and Arithmetic
Recipes
Weight and Mass
Atomic Mass

# What is the mass of a pear in grams?

The actual weight of a regular pear would be about 4 ounces.

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Atomic Mass

Bismuth

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Atomic Mass

# If an atom has 6 protons 8 neutrons and 6 electrons what is the atomic mass of the atom?

The atomic mass is the number of protons, plus the number of neutrons. In this case, 8 + 6 = 14.

Furthermore, the six protons (atomic number) tells me that this is carbon; the six electrons tell me that this is a carbon atom, rather than a carbon ion (an ion is when the number of electrons does not equal the number of protons, making the atom electrically non-neutral). The eight neutrons tell me that this is an isotope (in other words, a version) of carbon called carbon-14, which happens to be mildly radioactive; and therefore useful to archaeologists in dating human artifacts.

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Mathematical Constants
Atomic Mass

# How do calculate atomic mass?

Number of protons plus the number of neutrons (electrons don't matter as they have such a small mass).

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Atomic Mass

# Why is atomic number better than atomic mass for organizing the elements in the periodic table?

Atomic number is a unique number for each element. No two elements have the same atomic number. Atomic number is also the number of protons in the nuclei of the atoms of any given atom. Atomic mass, however, is the number of protons, neutrons and electrons. The number of neutrons can vary with different isotopes of the same element, this means that atomic mass can vary with different isotopes. So atomic number does not vary, but atomic mass does, so it is more logical to use atomic number to organize the elements. In addition, when the elements are arranged according to atomic number into seven rows and 18 columns, it becomes evident that there are certain trends that occur across the periods, and that elements in the same group have similar properties.

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Atomic Mass

# Mass number vs atomic mass?

atomic mass is the number of protons in an atom

mass number is the number of protons plus neutrons in an atom

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Atomic Mass

# Is the atomic mass of hydrogen 3?

The atomic mass of the most common form of hydrogen is 1.

There are isotopes of hydrogen with a mass of 2 (deuterium) and 3 (tritium), but they are rare.

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Atomic Mass

# How do you find the approximate atomic mass of an atom?

Look it up in a good Periodic table (eg. searchable in WikiPedia)

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Mathematical Constants
Atomic Mass

# How do you calculate effective atomic mass?

Aeff=(Zeff)/((Z/A)eff)

Zeff=wi*Zi

wi is weight fraction in ith element in compound. for example water has 0.112 H and 0.888 O.

(Z/A)eff=wi*Zi/Ai

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Atomic Mass

# What does the atomic mass of an element indicate?

The average weight in grams of one mole of the element.

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Mathematical Constants
Atomic Mass

# Atomic mass used in a sentence?

The atomic mass of an element is the weighted average of the masses of all the stable isotopes of the element (if it has any), weighted by the natural occurrence levels of the isotopes in the elements as found on earth or in the atmosphere.

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Mathematical Constants
Atomic Mass

# What is the protons atomic mass?

The mass of proton is 1,672 621 637(83)×10-27 kg.

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Physics
Chemistry
Nuclear Physics
Atomic Mass

# What is mass?

Mass is the quantitative measure of inertia, or the resistance of a body to a change in motion.

The greater the mass, the smaller is the change produced by an applied force. Unlike weight, the mass of an object remains constant regardless of its location. Thus, as a satellite moves away from the gravitational pull of the Earth, its weight decreases but its mass remains the same. In ordinary, classical chemical reactions, mass can be neither created nor destroyed. The sum of the masses of the reactants is always equal to the sum of the masses of the products.

There is another meaning that I think you could mean also. Mass is the religious sermon catholics attend, usually on a Sunday, but also on a saturday.

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Atomic Mass

# What has a lower atomic mass cobalt or nickel?

Interestingly, nickel has a lower atomic mass (58.693) than cobalt (58.933), even though cobalt has a lower atomic number (27) than nickel (28).

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Mathematical Constants
Atomic Mass

# What does the atomic mass equals the number of?

An isotope's mass number is the sum of the protons and neutrons in each atomic nucleus of the isotope.

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Atomic Mass

Helium (4.0026)

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Atomic Mass

# This element has an atomic mass of 20.183?

Neon (20.1797)

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Chemistry
Atoms and Atomic Structure
Atomic Mass

# What two particles make up the atomic mass of an atom?

Protons and Neutrons.

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Atomic Mass

# What does atomic mass and atomic number represent?

The atomic number is the number of protons in the nucleus of an atom.

(Note: that in a neutral atom the number of protons in the nucleus is also equal to the number of electrons the atom has)

The atomic mass is the mass (weight) of all the components of the atom but is dominated by the nucleus composed of protons and neutrons. Basically atomic mass is how many times an atom of an element is heavier than an atom of hydrogen, (whose atomic mass is taken as unity ).

(Note: atoms with the same atomic number [ie an element] may have slightly differing atomic masses. This is because atoms can have differing numbers of neutrons in their nucleus. These variations in atomic mass are called "isotopes" of that element)

I have made a related link below showing you a Periodic Table of the Elements. The numbers on the table are the atomic numberof the element.
An element's atomic number represents the number of protons that are present in the nucleus of an atom in that element.
The atomic number represents the number of protons there is in that element. It also represents the number of electrons for that particular element only if the atom is atomically neutral and is not electrically charged. Typically, an atom does not lose protons so it is reliable to base this number on the number of protons in an atom as opposed to the number of electrons, seeing that electrons can be easily lost.

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Atomic Mass

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Atomic Mass

# What is the average atomic mass of Beanium? 