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4 years ago

Potassium has nineteen protons. how many electrons does a neutral potassium atom have?

Chemistry

2 answers:

Flauer [41]4 years ago

8 0

It has 19 electrons. I hope this helps.

prohojiy [21]4 years ago

4 0

Answer:

c. 19

Explanation:

Potassium is a chemical element of the periodic table whose chemical symbol is K, whose atomic number is 19. It is an alkaline metal of white-silver color, which abounds in nature in the elements related to salt water and other minerals. It oxidizes rapidly in air, is very reactive, especially in water, and chemically resembles sodium. It is an essential chemical element.

The K having an atomic number of 19 means that it has 19 protons and in normal conditions for a neutral atom it will have 19 electrons, and being one step away from argon gas makes it extremely unstable.

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What is the percent of aluminum in al2(so4)3

Lena [83]

Answer : The percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

Solution :

Molar mass of Aluminium = 26.98 g/mole

Molar mass of $Al_2(SO_4)_3$ = 342.15 g/mole

First we have to calculate the mass of Aluminium.

Mass of 2 Al atoms = 2 × 26.98 g/mole = 53.96 g/mole

Now we have to calculate the percent composition of Aluminium in $Al_2(SO_4)_3$

$\%\text{ of Al}=\frac{\text{ Mass of Al}}{\text{ Total mass}}\times 100$

Now put all the given values in this formula, we get

$\%\text{ of Al}=\frac{53.96g/mole}{342.15g/mole}\times 100$

$\%\text{ of Al}=15.77\%$

Therefore, the percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

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boyakko [2]

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4 years ago

Which of the following involves a chemical reaction?

Andrews [41]

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3 years ago

What is the percent change when an iodine atom (I) becomes an ion (I-)?

VashaNatasha [74]

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3 years ago

If 0.8 g of gas Z occupies 0.56 dm at s.1.p., calculate its relative molecular mass. (Molar volume of gas is 22.4 dm.)

photoshop1234 [79]

Answer:

Explanation:

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