H-atoms in azides refer to the hydrogen atoms attached to the nitrogen atoms in the azide functional group. Azides are compounds containing the N3- group, which consists of three nitrogen atoms. The H-atoms in azides are important for the overall stability and reactivity of the molecule. In some cases, these H-atoms can be replaced with other functional groups through chemical reactions, leading to the formation of new compounds with different properties. **

An alkane with 390 carbon atoms will have twice as many hydrogen atoms as carbon atoms. This is because each carbon atom forms four single covalent bonds, and each hydrogen atom forms one single covalent bond. Therefore, the number of hydrogen atoms in an alkane with 390 carbon atoms will be 780. **

An alkane with 390 carbon atoms will have twice as many hydrogen atoms as carbon atoms. This is because each carbon atom forms four single bonds with other atoms, typically hydrogen atoms. Therefore, the alkane with 390 carbon atoms will have 780 hydrogen atoms. **

The electronegativity difference between the carbon atoms in hexane is very small, as carbon has an electronegativity value of 2.55. This means that the carbon-carbon bonds are nonpolar. On the other hand, the electronegativity difference between the hydrogen atoms and the carbon atoms is also very small, as hydrogen has an electronegativity value of 2.20. Therefore, the carbon-hydrogen bonds in hexane are also nonpolar. Overall, the electronegativity differences in hexane are minimal, resulting in nonpolar covalent bonds throughout the molecule. **

Yes, ethanol can sometimes have 5 hydrogen atoms instead of 6. This occurs when ethanol undergoes dehydrogenation, a chemical reaction in which hydrogen atoms are removed from the molecule. This can happen under certain conditions, such as high temperature and the presence of a catalyst. As a result, ethanol can lose a hydrogen atom and form ethylene, which has 5 hydrogen atoms. **

The H-atoms of a CH4 molecule are not in the same plane because of the tetrahedral shape of the molecule. The carbon atom at the center of the molecule is bonded to four hydrogen atoms, and the arrangement of these bonds creates a tetrahedral geometry. This geometry results in the hydrogen atoms being positioned at the four corners of a tetrahedron, with the carbon atom at the center. As a result, the H-atoms are not in the same plane, but rather positioned at the corners of a three-dimensional tetrahedron around the central carbon atom. **

Oxygen atoms are the building blocks of the element oxygen, which is essential for life and makes up a large portion of the Earth's atmosphere. Oxygen atoms have 8 protons and typically 8 neutrons, giving them a total atomic mass of 16. They are known for their ability to form strong bonds with other elements, making them crucial for the formation of molecules such as water and carbon dioxide. Carbon atoms are the building blocks of the element carbon, which is a fundamental component of all known life on Earth. Carbon atoms have 6 protons and typically 6 neutrons, giving them a total atomic mass of 12. They are known for their ability to form long chains and complex structures, making them essential for the formation of organic molecules such as proteins, carbohydrates, and DNA. **

Some atoms are larger than others because they have more protons, neutrons, and electrons, which increases their atomic mass and size. The number of electron shells and the distance of the outermost electrons from the nucleus also contribute to the size of an atom. Additionally, the arrangement of electrons in the electron shells can affect the size of an atom. Overall, the size of an atom is determined by a combination of its atomic number, electron configuration, and atomic mass. **