Answer:
<u><em>D.</em></u>
<u><em>All of these ions</em></u>
Explanation:
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Answer:
Explanation:
The Lanthanides were first discovered in 1787 when a unusual black mineral was found in Ytterby, Sweden. This mineral, now known as Gadolinite, was later separated into the various Lanthanide elements. In 1794, Professor Gadolin obtained yttria, an impure form of yttrium oxide, from the mineral.
Answer: The products usually weigh more than the reactants.
Explanation:
Electrons carry a negative charge, so when you add on to the electron, the ion gets more negative.
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