Rubidium and cesium are both highly reactive alkali metals and must be stored in airtight containers to prevent them from reacting with moisture and oxygen in the air. They are typically stored under a layer of mineral oil or kerosene to prevent contact with air. Additionally, they are often kept in a cool, dry place to minimize the risk of spontaneous combustion. Proper handling and storage of rubidium and cesium are essential to ensure safety and prevent accidents. **

The shell model for rubidium is based on the arrangement of its electrons in energy levels or shells. Rubidium has 37 electrons, with the electron configuration of [Kr] 5s1. This means that rubidium has a full inner shell of electrons (from the noble gas krypton) and one valence electron in the outermost shell. This configuration makes rubidium an alkali metal, which is highly reactive due to its tendency to lose that single valence electron. **

The reaction equation of rubidium hydroxide with water is: RbOH + H2O → Rb+ + OH- + H2O. In this reaction, rubidium hydroxide dissociates into rubidium ions (Rb+) and hydroxide ions (OH-) in water. **

The third atomic orbit of the rubidium atom can hold up to 18 electrons according to the Aufbau principle, which states that electrons fill orbitals starting with the lowest energy level. Rubidium has 37 electrons, so the first and second orbits are filled with 2 and 8 electrons, leaving 27 electrons for the third orbit. However, due to the electron configuration of rubidium, the third orbit only holds 16 electrons, as the remaining 11 electrons are placed in the fourth orbit. **

The choice between BWL (Betriebswirtschaftslehre, or business administration) and Banking and Finance depends on your career goals and interests. BWL provides a broad understanding of business management, including areas such as marketing, accounting, and human resources, while Banking and Finance focuses specifically on financial institutions and markets. If you are interested in a career in banking, investment, or financial analysis, Banking and Finance may be the better choice. However, if you are interested in a broader range of business opportunities, BWL may be more suitable. It's important to consider your long-term career goals and the specific skills and knowledge you want to develop. **

A mortgage is a specific type of loan that is used to purchase real estate, typically a home. It is a secured loan, meaning the property serves as collateral for the loan. On the other hand, a loan is a broader term that can refer to various types of borrowing, such as personal loans, auto loans, or student loans. Loans can be secured or unsecured, depending on the lender's requirements. **

A debt collection loan shark is a person or organization that lends money to individuals at extremely high interest rates, often using aggressive or illegal tactics to collect payments. They target individuals who are in desperate need of quick cash but may not have access to traditional forms of credit. These loan sharks can trap borrowers in a cycle of debt, making it difficult for them to repay the loan and escape the high interest rates and fees. **

In the event of death with a mortgage loan, the responsibility for the loan typically falls to the deceased person's estate. The executor of the estate will need to notify the lender of the borrower's passing and make arrangements for the outstanding balance to be paid off. If there is a co-borrower or co-signer on the loan, they may become responsible for the remaining payments. In some cases, life insurance policies or other assets may be used to settle the mortgage debt. **