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- 2. _ Is the simplest and most abundant element in the universe, consisting of one proton and one electron, and it plays a crucial role in the formation of stars and the production of energy through nuclear fusion.
- 4. _ Are formed when two atoms share one or more pairs of electrons, allowing them to achieve greater stability by filling their outer electron shells.
- 6. _ Are a type of chemical bond formed through the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions), typically resulting from the transfer of electrons from one atom to another.
- 8. _ Is a highly reactive, greenish-yellow gas at room temperature, commonly used as a disinfectant in water treatment and as a bleaching agent in various industrial processes.
- 10. _ Are the basic structural and functional units of all living organisms, capable of carrying out essential life processes such as metabolism, growth, and reproduction.
- 11. _ Is a highly reactive, soft,silvery-white metal that belongs to the alkali metal group and is essential for various biological processes, including nerve function and fluid balance in living organs
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- 1. table _ Is a specialized piece of furniture designed for children, often used in medical settings, that accommodates their smaller size and provides a safe and comfortable space for examinations, treatments, or activities.
- 3. _ Is a colorless, odorless gas essential for life on Earth, as it supports respiration in animals and combustion in fires, and it makes up about 21% of the Earth’s atmosphere.
- 4. link _ Refers to the connection between atoms in a molecule, which can be formed through various types of bonds, such as ionic, covalent, or metallic bonds, determining the molecule’s structure and properties.
- 5. _ Are the fundamental building blocks of matter, consisting of a nucleus made up of protons and neutrons, surrounded by a cloud of electrons that determine an element’s chemical properties and behavior.
- 7. _ Is the dense, central core of an atom that contains protons and neutrons, playing a crucial role in determining the atom’s mass and its overall positive charge.
- 9. _ Commonly known as water, is a chemical compound composed of two hydrogen atoms covalently bonded to one oxygen atom, and it is essential for all forms of life, serving as a solvent, a medium for biochemical reactions, and a key component of ecosystems.