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Alekssandra [29.7K]
3 years ago
12

19 pts - How do you determine if something is isoelectronic?

Chemistry
1 answer:
Anna71 [15]3 years ago
5 0
Isoelectronic means equal number of electrons.

The method to determine if elements are sioelectronic is:

1) Determine the atomic number of the element (search the element in the periodic table).

2) The atomic number is equal to the number of protons (always, by definition).

3) If the atom is neutral, the number of electrons is equal to the number of protons.

3) If the species is not neutral then:

     - if it is a negative ion, add as many electrons as the magnitude of the charge of the ion

    - if iit is a positive ion, subtract as many electrons as the magnitude of the charge of the ion.

4) One by one
<span>
species          atomic number              charge          number of electrons
                      number of protons

O₂,                    8                                     0                 8 (each atom)
F-                     9                                      -1               9 + 1 = 10    
Ne                  10                                      0                10
Na                  11                                       0               11

So, in that group only F- and Ne are isoelectronic, each with 10 electrons

Se2-               34                                      -2                34 + 2 = 36
Br-                  35                                      -1                35 + 1 = 36
Kr                   36                                       0                36
Rb+                37                                      +1               37 - 1 = 36

So, in that group all are isoelectronic.
   
I-                     53                                     -1                 53 + 1 = 54
Xe                   54                                     0                  54
Cs                   55                                     0                  55  
Ba2+               56                                    +2                 55 - 2 = 53

So, in that group only I- and Xe are isoelectronic.
</span>
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B. Heating up the reaction will increase the entropy of a reaction.

<h3>What is entropy?</h3>

Entropy is the measure of the degree of disorderliness of a system.

Entropy is also the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

S = ΔH/T

where;

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Entropy increases in reactions in which the total number of product molecules is greater than the total number of reactant molecules.

However, entropy increases as temperature increases. Thus, heating up the reaction will increase the entropy of a reaction.

Learn more about entropy here: brainly.com/question/6364271

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Answer:

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Explanation:

Nitrogen is located in the p-block of the periodic table (groups 13-18) and is on the 2nd period.

The 2nd period tells us the principal energy level (a quantum number) is n = 2. Therefore, it must have already filled up the 1s sublevel.

The groups 13-18 on period 2 tells us that the 2s sublevel is also filled.

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