Which element does the electron configuration 1s22s22p2 represent? B C N K
2 answers:
Answer:
Carbon
Explanation:
the electronic configuration corresponds to the number of electrons that an atom of an element has and these are compensated with the number of protons in the nucleus of the element, therefore the number of protons in the nucleus is equal to the number of electrons in the orbitals.
The number of protons in the nucleus corresponds to the number Z, this is what allows us to differentiate between one element and another
We add the electrons
2+2+2=6
The number of electrons is 6 that matches the number of protons (which is the number Z)
We look for in the periodic table the element Z = 6 (atomic number)
The element that corresponds to this number is carbon
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This question is describing two chemical equations whereby the concentration of ammonia has to be determined. The first reaction is between 25.00 mL of ammonia and 50.00 mL of 0.100-M HCl whose excess was neutralized with 21.50 mL of 0.050-M Na₂CO₃ and thus, the concentration ammonia in the cloudy solution was determined as 0.114 M.
First of all we need to go over the titration of the excess HCl with Na₂CO₃ by writing the chemical equation it takes place when they react:
Whereas the mole ratio of HCl to Na₂CO₃ is 2:1 and the volume of the HCl leftover is determined as follows:
Next, we infer that the consumed volume of HCl by the ammonia solution was:
Then, we write the chemical equation that takes place between ammonia and HCl:
Whereas the mole ratio is now 1:1, which means that the concentration of ammonia was:
Learn more:
- (Titration) brainly.com/question/15687419
- (Titration) brainly.com/question/25328286