Answer:- The natural abundance of 
is 0.478 or 47.8% and 
is 0.522 or 52.2% .
Solution:- Average atomic mass of an element is calculated from the atomic masses of it's isotopes and their abundances using the formula:
Average atomic mass = mass of first isotope(abundance) + mass of second isotope(abundance)
We have been given with atomic masses for and as 150.919860 and 152.921243 amu, respectively. Average atomic mass of Eu is 151.964 amu.
Sum of natural abundances of isotopes of an element is always 1. If we assume the abundance of as n then the abundance of would be 1-n .
Let's plug in the values in the formula:
151.964=150.919860n+152.921243-152.921243n
on keeping similar terms on same side:
negative sign is on both sides so it is canceled:
The abundance of is 0.478 which is 47.8%.
The abundance of is = 
= 0.522 which is 52.2%
Hence, the natural abundance of is 0.478 or 47.8% and is 0.522 or 52.2% .
The statement "Although sulfuric acid is a strong electrolyte, an aqueous solution of H₂SO₄ contains more HSO₄⁻ ions than SO₄²⁻ ions is <u>True.</u> This is best explained by the fact that H₂SO₄ <u>is a diprotic acid where only the first hydrogen completely ionizes.</u>
Why?
H₂SO₄ is a diprotic acid. That means that it has <u>two hydrogen ions</u> to give to the solution. The two dissociation reactions are shown below:
H₂SO₄ + H₂O → HSO₄⁻ + H₃O⁺
HSO₄⁻ + H₂O ⇄ SO₄²⁻ + H₃O⁺
As the arrows show, the first dissociation is complete, meaning that all the sulfuric acid that is present initially is dissociated into HSO₄⁻ and H₃O⁺. However, the second dissociation is incomplete, and it's actually an equilibrium with an acid constant (Ka)of 1.2×10⁻².
That means that if the initial concentration of H₂SO₄ was 1M, the concentration of HSO₄⁻ is going to be 1M as well, but <u>the concentration of SO₄²⁻ is going to be much less than 1M</u>, according to the dissociation constant.
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Potassium dihydrogen phosphate (KH2PO4) and sodium nitrate (NaNO2)
Molecular equation:
KH₂PO₄ (aq) + 3NaNO₂(aq) → Na₃PO₄(s) + KNO₂(aq) + 2HNO₂ (aq)
The net ionic equation is:
3Na⁺(aq) + PO₄⁻(aq) → Na₃PO₄(s)
The rest of the ions are spectator ions and tend to cancel out on both sides of the reaction.
the arrangement of the mineral's atoms
Explanation:
The arrangement of atoms in a mineral determines both the physical and chemical property of such a substance.
- Minerals are naturally formed inorganic chemical substances with a definite and ordered atomic arrangement. Most minerals are usually solid in nature.
- Minerals have an ordered atomic arrangement and this dictates its properties.
- For example, the luster minerals can be attributed to the faces of the ordered crystals that makes up the mineral.
- Rocks breaks in certain fashion due to the nature and the ordered structure of the atoms making up their minerals.
Learn more:
rocks an aggregate of minerals brainly.com/question/6568161
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There are two electrons in the outermost shell of calcium
