Across
- 2. Its found in milk for humans
- 3. the sum of the numbers of protons and neutrons present in the nucleus of an atom.
- 7. a column in the periodic table of the chemical elements
- 10. he property of an element that determines the number of other a ionic
- 12. (non metal) atomic number is 9
- 13. (non metal) atomic weight is 11
- 15. the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
- 18. a positive electric charge
- 20. a group of rare gases that include helium, neon, argon, krypton, xenon
- 21. has groups and periods
- 22. any of the six chemical elements that make up Group 1 (Ia) of the periodic table
- 23. inert gas
- 25. elements on the right of the periodic table
- 27. A neutral chemical substance is neither an acid nor an alkali
- 28. (non metal) chemical symbol is O
Down
- 1. an electron in an atom, ion, or molecule not associated with any single atom or a single covalent bond
- 4. (Metal) atomic weight is 56
- 5. (non metal) atomic weight is 4
- 6. subatomic particle that has a positive charge equal magnitude
- 8. The horizontal rows of the periodic table
- 9. neutral subatomic particle
- 11. monosaccharide sugar
- 14. inert gas
- 16. any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
- 17. the interatomic linkage that results from the sharing of an electron pair between two atoms.
- 18. a characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.
- 19. (Metal) chemical symbol is TI
- 24. membrane-bound organelle that contains the cell's chromosomes
- 26. a negatively charged subatomic particle