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raketka [301]
3 years ago
5

Why are there 8 elements in the 3rd stage in a periodic table ?​

Chemistry
2 answers:
Olin [163]3 years ago
5 0

Answer:

stu pid

Explanation:

olga2289 [7]3 years ago
3 0

Answer:

PLEASE MARK ME AS THE BRAINLIEST

Explanation:

According to the 2n2 rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

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3 0
3 years ago
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There is 35 mg of sodium in a can of Coke. You determine it to be 28 mg. What is your percent error?
natali 33 [55]

Answer:

The answer is

<h2>20 %</h2>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual volume = 35 mg

error = 35 - 28 = 7

The percentage error is

P(\%) =  \frac{7}{35}  \times 100 \\  =  \frac{1}{5}  \times 100 \\  =  20

We have the final answer as

<h3>20 %</h3>

Hope this helps you

8 0
3 years ago
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how many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?
vova2212 [387]
The formula of citric acid is:

           CO2H
           |
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|
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I bolded the 4 hydrogens that can be subsituted by sodium.


Three of those hydrogens belong to carboxyl group (- CO2H) and one to a hydroxyl group (- OH).


You need to take into account that 4 H will form 2 H2 molecules.


So, the answer is that 2 moles of molecules will be formed from 1 mole of citric acid molecules.


   

4 0
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4. Pb +FeSO, - PbSO, +Fe<br> Reaction Type:
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Explanation:

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