Ch. 6&7 Crosswords
Across
- 4. the sum of the numbers of protons and neutrons in the nucleus of an atom
- 5. a horizontal row of elements in the periodic table
- 6. the number of protons in the nucleus of an atom
- 8. a unit of mass that shows the mass of an atom or molecule
- 11. a group in the periodic table that is less reactive than the alkali group and are important compounds for our body
- 12. a subatomic particle with no charge located in the atom's nucleus
- 13. one of the elements of group 18 in the periodic table
- 15. a unique element that has no connections to all the other elements in the periodic table
- 16. the mass of an mass expressed in atomic mass units
- 18. an atom that has the same number of protons as the other atoms in the same element but have different number of neutrons
Down
- 1. one of the elements of group 1 in the periodic table; very reactive
- 2. a group that is less reactive than both alkali and alkaline-earth metals
- 3. a vertical column of elements in the periodic table; elements in group shares chemical properties
- 7. very reactive group in the periodic table that have similar chemical properties, but have different physical properties
- 9. a pattern in the elements discovered by Dmitri Mendeleev that is later turned into a chart (table)
- 10. the law that says that the repeating chemical and physical change changes periodically with the atomic numbers of the elements
- 11. the smallest unit of an element that maintains the properties of that element
- 14. describes something that occurs or repeats at regular intervals
- 17. a subatomic particle that has a positive charge and is located in the atom's nucleus