Across
- 1. An atomic group in which two or more nonmetallic atoms are electrically charged or neutral by a chemical bond, defined as the smallest unit particle with intrinsic properties of a material. It also refers to a group of atoms made up of one atom, such as an inert gas.
- 3. The problem is the kind of work that can make people think or bully. In addition, the Standard Korean Dictionary defines it as follows. a question asking for an answer to be the subject of argument, discussion, research, etc
- 5. When divided into small units that make up a substance, it is usually as follows. Molecules (m) - Atoms (m) - Nuclear (m) - Proton/Neutron (m) - Particles: Particles have again mediators, leptons, quarks, etc., and thus "all materials are made of quarks and leptons."
Down
- 2. It refers to the law that the mass ratio of each component element constituting a compound is constant. It was discovered by French chemist and pharmacist Joseph Louis Proust in 1799. Along with the law of multiple proportions, it is the basis of stoichiometry.
- 4. It is the smallest unit of everyday matter. Because everyday materials are composed of elements, they are synonymous with units that cannot be further broken through chemical reactions. All solids, liquids, gases, and plasma are made up of atoms.