Across
- 3. electrically neutral group of two or more atoms held together by chemical bonds.
- 5. Every atom will have the same number of
- 7. Periodic table is a row of chemical elements.
- 8. table of elements It is widely used in chemistry, physics, and other sciences.
- 9. a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 11. The basic unit of a chemical element.
Down
- 1. number proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.
- 2. molecules composed of atoms from more than one element held together by chemical bonds.
- 4. a part or aspect of something abstract, especially one that is essential or characteristic.
- 6. a group is a column of elements in the periodic table.
- 10. the same mass as a proton but without an electric charge.