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Sergio039 [100]
2 years ago
9

I'll give brainliest

Chemistry
2 answers:
Levart [38]2 years ago
8 0

Answer:

it's nitrogen

Explanation:

nitrogen has 7 protons 7 electrons and 7 neutrons and that's just demonstrated on the picture

sveta [45]2 years ago
3 0

Answer: Nitrogen

Explanation:

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Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:
ankoles [38]
DeltaH formation = deltaH of broken bonds - deltaH of formed bonds

Broken bonds: tiple bond N-N and H-H bond
Formed bonds: N-H and N-N bonds

You also have to take note of the molar coefficients

deltaH formation = <span> [(N≡N) + 2 * (H-H)] - [4 * (N-H) + (N-N)] 
                           = (945 + 2*436) - (4*390 + 240)
                            = 17 kJ/mol

The answer is 17 kJ/mol.</span>
8 0
3 years ago
Which atom, selenium (Se) or Arsenic (As), has the higher electron affinity and why?
IrinaVladis [17]

Answer:

5. Selenium, because it does not have a stable, half-filled p subshell and adding an electron does not decrease its stability.

Explanation:

Electron affinity is the amount of energy released when an isolated gaseous atom accepts electron to form the corresponding anion.

Selenium:-

The electronic configuration of the element is:-

[Ar]3d^{10}4s^24p^4

Arsenic:-

The electronic configuration of the element is:-

[Ar]3d^{10}4s^24p^3

The 4p orbital in case of arsenic is half filled which makes the element having more stability as compared to selenium.

Thus, selenium has higher electron affinity because adding electron does not decrease the stability as in case of arsenic.

8 0
2 years ago
HELP FAST FOR BRAINLIEST
krek1111 [17]

Answer:

only ones ik

14: dependant

18: constraints

3 0
3 years ago
Which of these statements best describes the relationship between elements, compounds, and pure substances?
olchik [2.2K]

pure substances can be divided into two groups; elements and compounds

5 0
2 years ago
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Suggest the stable ion for phosphorus and why?
Darya [45]

Phosphorous has 5 valence electrons and so gaining 3 electrons will make it isoelectronic with the stable noble gas argon, and will produce the P3- ion

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2 years ago
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