Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion
Period 4 transition element that forms 2+ ion with a half‐filled d sub level is
Manganese (Mn)
What is the half-filled d sub-level?
Transition metals are an interesting and challenging group of elements. They have perplexing patterns of electron distribution that don’t always follow the electron-filling rules. Predicting how they will form ions is also not always obvious.
Transition metals belong to the d block, meaning that the d sublevel of electrons is in the process of being filled with up to ten electrons. Many transition metals cannot lose enough electrons to attain a noble-gas electron configuration. In addition, the majority of transition metals are capable of adopting ions with different charges. Iron, which forms either the Fe2+ or Fe3+ ions, loses electrons as shown below.
Some transition metals that have relatively few d electrons may attain a noble-gas electron configuration. Scandium is an example. Others may attain configurations with a full d sublevel, such as zinc and copper.
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Answer: B, the gas is being squeezed out of the liquid.
Explanation: The gas does not want to be trapped inside of the liquid, so it is trying to force it’s way out. Therefore creating more pressure in the container or whatever the liquid is being held in.
The Organisms that formed them likely lived during the Paleozoic era.
Explanation:
Given parameters:
Mass of aspirin = 0.45g
Mass of C = 0.27g
Mass of H = 0.02g
Mass of O = 0.16g
Unknown:
Mass percentage of the constituents = ?
Solution:
To find the mass percent, ensure that sum of the mass of the elements add up to the that of the given mass of aspirin
Total mass = 0.27 + 0.02 + 0.16 = 0.45g
Now express each of the given percentages to that of the total one.
mass percent of C = 
x 100 = 60%
mass percent of H = 
x 100 = 4.4%
mass percent of O = 
x 100 = 36%
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