Answer:
.
Explanation:
Based on the electron configuration of this ion, count the number of electrons in this ion in total:
.
Each electron has a charge of .
Atoms are neutral and have charge. However, when an atom gains one extra electron, it becomes an ion with a charge of . Likewise, when that ion gains another electron, the charge on this ion would become .
The ion in this question has a charge of . In other words, this ion is formed after its corresponding atom gains two extra electrons. This ion has electrons in total. Therefore, the atom would have initially contained electrons. The atomic number of this atom would be .
Refer to a modern copy of the periodic table. The element with an atomic number of is sulphur with atomic symbol . To denote the ion, place the charge written backwards ("" for a charge of ) as the superscript of the atomic symbol:
.
This question is asking for an element with 5 valence electrons. Just go to the row it is in (excluding transition metals) and count over.
The answer would be c. P
Answer:
We normally separate unreacted hydrogen from ammonia (product) in Haber process. The reaction mixture contains some ammonia, plus a lot of unreacted hydrogen and nitrogen. The mixture is cooled and compressed, causing the ammonia gas to condense into a liquid.
And this is y I should of paid attention in that one science class in middle school that taught this...
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Answer:
A supersaturated solution made out of sugar and oil is crystallized on a surface suitable for crystal nucleation such as a stick.
I hope this helps.