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Alex777 [14]
3 years ago
6

Whic number of the periodic table is the atomic number and which number is the atomic mass?

Chemistry
1 answer:
Anettt [7]3 years ago
5 0

Answer:

The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.

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All of the above

Explanation:

Their all chemical change

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Sodium forms a 1+ ion, while fluorine forms a 1-lon. Write the electron configuration for each ion. Why don't these two elements
jok3333 [9.3K]

Answer:

Explanation:

Given elements:

    Sodium

    Fluorine

The ion Na⁺ is made up of 10 electrons, its electronic configuration is:

            1s² 2s² 2p⁶

Ion F⁻ is made up of 10 electrons, its electronic configuration is:

           1s² 2s² 2p⁶

These ions do not form +2 because they cannot attain stability by losing or gaining two electrons.

Sodium atom is made up of one valence electron. If it loses one electron, it will be isoelectronic with Neon.

Fluorine has 7 valence electrons, to attain stability, it must gain one electron to form an octet. This way it will be isoelectronic with Neon.

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4 0
3 years ago
For the reaction NH4NO3 (s) → N2O (g) + 2H2O (l), you decompose 1 mole NH4NO3 and only get 0.75 moles of N2O. The percent yield
attashe74 [19]

Answer:

The answer to your question is False.

Explanation:

Data

1 mole of NH₄NO₃

0.75 moles of N₂O

Percent yield = 25%

Chemical reaction

               NH₄NO₃   ⇒   N₂O  +  2H₂O

Process

1.- Determine the theoretical yield

              1 mol NH₄NO₃ ------------- 1 mol of N₂O

2.- Calculate the percent yield

             Percent yield = Actual yield / Theoretical yield  x 100

-Substitution

              Percent yield = 0.75 / 1 x 100

-Simplification

              Percent yield = 0.75 x 100

-Result

              Percent yield = 75%

Conclusion

False, the actual percent yield is 75%

5 0
3 years ago
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