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How do I find the atomic mass number?

shardaja sanders

Community Answer

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

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Where are the neutrons and protons on a periodic table?

Community Answer

The number of protons in one atom of an element is indicated by the atomic number, printed at the top of an element's box on the periodic table. The number of neutrons is not listed on the periodic table. However, you can calculate the number of neutrons in an atom of an element. First, find the atomic weight, listed in the bottom of the element's box. Round this number to the nearest whole number to obtain the mass number. Finally, subtract the atomic number from the mass number.

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Question

What are the protons for gold?

Community Answer

The atomic number represents both electrons and protons, so the number of protons for gold is 79.

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What do atoms contain?

Community Answer

Protons, which are positively-charged particles; neutrons, which are neutral; and electrons, which are negatively-charged.

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Question

How do I calculate the atomic weight?

shardaja sanders

Community Answer

To calculate the average atomic weight, each exact atomic weight is multiplied by its percent abundance (expressed as a decimal). Then, add the results together and round off to the appropriate number of significant figures.

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How can I find out the atomic mass from the electron configuration of an element?

Community Answer

Determine the number of electrons and know that for most atoms, the electron number equals the number of protons (a balanced atom). Most elements have roughly an equal number of protons and neutrons. So, for example, the electron configuration of carbon shows 6 electrons, so 6 protons are likely present as are 6 neutrons, meaning the atomic mass of carbon is around 12.

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Question

How do I determine the atomic number of an element?

Community Answer

Subtract the number of neutrons from the mass number.

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What are atoms?

Community Answer

Atoms are the small particles that all matter is made of.

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How do I find the number of protons if the neutrons and atomic mass are not given?

Community Answer

For any stable atoms, the number of electrons and protons are usually the same.

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Question

How do I get protons, neutrons, and electrons only with the atomic number and atomic mass?

Ruby

Top Answerer

The protons and electrons should be the same as the atomic number. The number of neutrons is the number of protons taken away from the atomic mass.

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