B) 35 atoms
C) 6.23x10^-24 atoms
D) 2.26x10^24 atoms
Nonmetals, such as those in groups 14 and 17, generally gain electrons becoming more stable anions. Metals, like those in group 1, typically lose electrons and form stable cations. An example is in ionic compounds where metal atoms like sodium lose electrons and nonmetal atoms like chlorine gain electrons.
In the context of elements and their atoms, nonmetals, which include elements from group 14 and group 17, tend to gain electrons. This gain in electrons forms negative ions, or anions, which fills their outermost electron shell, making them energetically more stable.
On the other hand, metals like those from group 1, tend to lose electrons. This event makes them energetically more stable by forming positive ions, or cations, and allowing them to achieve an electron configuration similar to noble gases.
For instance, to fill their outermost shells, elements donate or accept electrons. In ionic compound formation, metals like sodium (Na) lose electrons while nonmetals like chlorine (Cl) gain these electrons, achieving a stable configuration.
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The answer is: 3) 7.64 days.
The most stable isotope of radon (Rn) is radon-222 with a half-life of 3.82 days.
After first half life (3.82 days) = 0.5 · 200 g.
After first half life (3.82 days) = 100 g of radon-222.
After second half life (7.64 days) = 0.5 · 100 g.
After second half life (7.64 days) = 50 g of radon-222.
Half-life is the time required for a quantity (in this example number of radioactive nuclei of radon-222) to reduce to half its initial value and is independent of initial concentration.