Across
- 5. an arrangement of chemical elements in order of atomic number that groups elements with common characteristics in the same area of the table
- 9. the smallest particle of an element that has the properties of the element and can exist either alone or in combination
- 11. one of the stable states of constant energy that may be assumed by a physical system used especially of the states of electrons in atoms
- 12. atoms of different elements can physically mix together or chemically combine in simple whole number ratios to form compounds
- 13. an elementary particle that has a negative charge of electricity and travels around the nucleus of an atom
- 17. a beam of electrons emitted by the cathode of an electrical discharge tube
- 19. any of more than 100 fundamental substances that consist of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances
- 20. the mass of any kind of atom usually expressed in atomic mass units
- 21. any of the forms of an element that differ in the number of neutrons in an atom
- 23. the central part of an atom that includes nearly all of the atomic mass and consists of protons and usually neutrons
- 24. a group of metals whose atom has a partially filled d subshell, or which can give rise to cations with an incomplete d subshell.
Down
- 1. a number that is characteristic of a chemical element and represents the number of protons in the nucleus
- 2. any number of entities (members) considered as a unit
- 3. the sum of the number of neutrons and protons in an atomic nucleus
- 4. a group of metals that all occur in nature and are shiny.
- 6. an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons
- 7. a group of metals that have only one electron and only occur in nature as compounds
- 8. atom with same atomic number, different number of neutrons
- 10. the smallest particle of a substance having all the characteristics of the substance and is composed of one or more atoms
- 14. the energy level of a physical system (as an atom) having the least energy of all its possible states
- 15. any one of several types of very small particles that make up matter
- 16. unit of mass for expressing masses of atoms or molecules
- 18. a particle that has a mass nearly equal to that of the proton but no electrical charge and that is present in all atomic nuclei except those of hydrogen
- 22. an atomic particle that occurs in the nucleus of every atom and carries a positive charge equal in size to the negative charge of an electron