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Lapatulllka [165]
3 years ago
8

Which unit is used for measuring atomic mass?

Chemistry
1 answer:
katrin2010 [14]3 years ago
5 0
The answer is Atomic Mass unit (Amu)
One unified atomic mass is numerically equivalent to 1 g/mol and  is equal to  the mass of one nucleon.
To describe atomic mass, it is also common to use Dalton as similar unit measurement as a form of respect to his works in Atom.
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Which pair of elements will form an ionic bond?
Y_Kistochka [10]
D because i looked it up lol
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3 years ago
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Refer to the periodic table tool and write the electron configurations of the following elements in both long and short terms
ahrayia [7]

Answer:-

Carbon

[He] 2s2 2p2

1s2 2s2 2p2.

potassium

[Ar] 4s1.

1s2 2s2 2p6 3s2 3p6 4s1

Explanation:-

For writing the short form of the electronic configuration we look for the nearest noble gas with atomic number less than the element in question. We subtract the atomic number of that noble gas from the atomic number of the element in question.

The extra electrons we then assign normally starting with using the row after the noble gas ends. We write the name of that noble gas in [brackets] and then write the electronic configuration.

For carbon with Z = 6 the nearest noble gas is Helium. It has the atomic number 2. Subtracting 6 – 2 we get 4 electrons. Helium lies in 1st row. Starting with 2, we get 2s2 2p2.

So the short term electronic configuration is [He] 2s2 2p2

Similarly, for potassium with Z = 19 the nearest noble gas is Argon. It has the atomic number 18. Subtracting 19-18 we get 1 electron. Argon lies in 3rd row. Starting with 4, we get 4s1.

So the short electronic configuration is [Ar] 4s1.

For long term electronic configuration we must write the electronic configuration of the noble gas as well.

So for Carbon it is 1s2 2s2 2p2.

For potassium it is 1s2 2s2 2p6 3s2 3p6 4s1

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3 years ago
A year ago If an element has 12 protons and 17 neutrons, how many electrons must it have?
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<span>if given element is neutral, than it has to have same number of protons and electrons. so in this case it is 12 electrons.</span><span>

Hope it helps :)

</span>
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A 3.1 L sample of hydrogen <u>d. contains the same number of molecules</u>

as 3.1 L of carbon dioxide at the same temperature and pressure.

This is the fundamental principle of <em>Avogadro’s hypothesis</em>: equal volume of gases at the same temperature and pressure contain the same number of molecules.

The sample of carbon dioxide has a <em>greater mass</em>, a <em>greater number of atoms</em>, and a <em>greater density</em>, than the sample of hydrogen.  

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What is a radioactive idotope?
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An isotope is when a normal atom has too many neutrons and its weight has been offset.
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