4. Darium (Da) is the name given to the hypothetical element with an atomic number of 120. It should belong to the Alkaline Earth Metals family and have two valence electrons. (a) Would this element have a larger or smaller atomic radius than radium (Ra)? Explain your answer using atomic structure (NOT position on the periodic table) and specific terminology learned in the course. Since it's an Alkaline Earth Metal it has two valence electrons. It has a larger atomic radius than radium because the differentiating electron will enter the next shell leading to an increase in the number of shells in darium compared to radium. The valence electron is in the 7th shell for radium whereas for darium the valence electron is in the 8th shell. Therefore, darium has a larger atomic radius than radium. Page 2 of 5 14U Spring 2021 (b) Write the quantum number sets that represent the two valence electrons in Da. (Hint: what orbital do these two valence electrons reside in? 1s, 2s...?) m, m, Electron #1 +1/2 Electron #2 -1/2
Basics in Organic Reactions Mechanisms
In organic chemistry, the mechanism of an organic reaction is defined as a complete step-by-step explanation of how a reaction of organic compounds happens. A completely detailed mechanism would relate the first structure of the reactants with the last structure of the products and would represent changes in structure and energy all through the reaction step.
Heterolytic Bond Breaking
Heterolytic bond breaking is also known as heterolysis or heterolytic fission or ionic fission. It is defined as breaking of a covalent bond between two different atoms in which one atom gains both of the shared pair of electrons. The atom that gains both electrons is more electronegative than the other atom in covalent bond. The energy needed for heterolytic fission is called as heterolytic bond dissociation energy.
Polar Aprotic Solvent
Solvents that are chemically polar in nature and are not capable of hydrogen bonding (implying that a hydrogen atom directly linked with an electronegative atom is not found) are referred to as polar aprotic solvents. Some commonly used polar aprotic solvents are acetone, DMF, acetonitrile, DMSO, etc.
Oxygen Nucleophiles
Oxygen being an electron rich species with a lone pair electron, can act as a good nucleophile. Typically, oxygen nucleophiles can be found in these compounds- water, hydroxides and alcohols.
Carbon Nucleophiles
We are aware that carbon belongs to group IV and hence does not possess any lone pair of electrons. Implying that neutral carbon is not a nucleophile then how is carbon going to be nucleophilic? The answer to this is that when a carbon atom is attached to a metal (can be seen in the case of organometallic compounds), the metal atom develops a partial positive charge and carbon develops a partial negative charge, hence making carbon nucleophilic.
Can you answer part B
Step by step
Solved in 2 steps with 2 images
