I Believe A is correct is correct because atoms are basically the building blocks of all type of matter, without atoms, there is no matter
B is correct as well because the amount protons of in an atom do define the element. E.g. There is 8 protons in an oxygen atom. oxygen is the 8th element on the periodic table.
C is incorrect because the atomic number is always different
D is incorrect as we already determined that Protons define the element
So A and B should be your answers
Answer:
Boron Carbonate; B₂(CO₃)₃
Explanation:
For names, carbonide does not exist; that rules out the first option. Carbide refers to just a carbon atom, not carbon and oxygen as in the polyatomic ion carbonate. That rids us of the third option. We are left with boron carbonate with the formula BCO or boron carbonate with the formula B₂(CO₃)₃.
Recall the carbonate polyatomic ion's formula: CO₃²⁻
Thus BCO cannot be the formula.
Option 4 is your answer, Boron Carbonate; B₂(CO₃)₃.
To further check your answer, observe the oxidation states of boron and the polyatomic ion carbonate. Boron can exist in oxidation states of either 2+ or 3+, and carbonate is only 2-; in this formula, boron will exhibit a 3+ state to balance out with carbonate.
2x3+ = 6+; 3x2- = 6-
6+ + 6- = 0; balanced
Answer:
because they need only one electron