Band theory
The atomic orbitals of metals combine to form <em>molecular orbitals</em>. The molecular orbitals are so close in energy that they form a <em>band</em> of energies.
<em>Ionic bond theory</em> is incorrect because there are no ions in metals.
<em>Covalent bond theory</em> is incorrect because there are no covalent bonds in metals.
<em>Electron bond theory</em> is incorrect because there is no theory with that name (but there is a <em>valence bond theory</em>).
The correct option is C.
The pitch of a string refers to the quality of sound that is produced by the string when it vibrates. There are three basic factors that affect the quality of pitch of a string, these are: the tension, the thickness of the string and the length of the string. The higher the thickness of the string, the lower the pitch of the string, thus, increasing the thickness of the string will lower the pitch.
Answer:
Helium has 2 electrons
Explanation:
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Answer:
Chromatography uses chromatography paper which is filter paper that is made of cellulose, a polymer. Cellulose is polar, therefore it attracts water molecules, as well as other polar substances. As the solvent reacts with the paper, it competes for the attraction of the molecules being separated.
Explanation:
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The mass sample of nicotine combusted = 2.625 mg (given)
Mass of 
produced = 7.1210 mg (given)
Mass of 
produced = 2.042 mg (given)
Molar mass of = 44 g/mol
Molar mass of = 18 g/mol
Percentage of Carbon = 
%
Percentage of hydrogen = 
%
Now, for percentage of nitrogen = 
%
Calculating the moles of each element:
- For
- For
- For
Dividing with the smallest mole value to calculate the molar ratio of each element:
Hence, the empirical formula for nicotine is 
.
