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 media may be currently reporting mostly pro-Ukrainian news due to several reasons. One reason could be that the Ukrainian government and its supporters are actively sharing information and updates with the media, leading to a higher volume of pro-Ukrainian news coverage. Additionally, there may be a global consensus in support of Ukraine due to the invasion by Russia, leading to a focus on highlighting Ukraine's perspective. Lastly, media outlets may be prioritizing reporting on the human impact of the conflict and the resilience of the Ukrainian people, which naturally leads to more pro-Ukrainian narratives. **

Press freedom, journalism, and social media are interconnected in several ways. Press freedom is essential for the practice of journalism, as it allows journalists to report and investigate without fear of censorship or reprisal. Social media has become a powerful tool for journalists to disseminate information and engage with their audience, but it also presents challenges such as the spread of misinformation and the potential for censorship by social media platforms. Additionally, the rise of social media has led to changes in the way news is consumed and produced, impacting the traditional role of journalists and news organizations. Overall, press freedom, journalism, and social media are all integral to the free flow of information and the functioning of a democratic society. **

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 melting point of a substance is determined by the strength of the forces holding its particles together. In the case of sodium and rubidium, both are alkali metals with similar metallic bonding. However, sodium has a smaller atomic radius and a higher nuclear charge compared to rubidium. This results in stronger metallic bonding in sodium, requiring more energy to overcome and thus a higher melting point compared to rubidium. **

The melting point of a metal is determined by the strength of the metallic bonds holding the atoms together. In the case of sodium and rubidium, sodium has a higher melting point because it has a smaller atomic radius and a higher nuclear charge compared to rubidium. This results in stronger metallic bonds in sodium, requiring more energy to break them and melt the metal. Additionally, sodium has a higher density than rubidium, which also contributes to its higher melting point. **