Across
- 2. a length or portion of time.
- 4. Number the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 7. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 8. a number of people or things that are located close together or are considered or classed together.
- 9. a part or aspect of something abstract, especially one that is essential or characteristic.
- 10. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
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- 1. table of elements the periodic table of chemical elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.
- 3. the basic unit of a chemical element
- 5. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 6. a thing that is composed of two or more separate elements; a mixture.
- 9. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.