Periodic Table and trends

12345678910111213141516171819202122232425262728
Across
  1. 3. Refers to a vertical column on the periodic table (numbered 1 through 18)
  2. 8. Gas Any of a group of rare gases that include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and usually radon (Rn); exhibit great stability and extremely low reaction rates
  3. 10. Electron a number of electrons (between one and eight) in the outer shell of an atom that are responsible for the chemical properties of the atom
  4. 13. A chemical property that describes the ability of an atom in a molecule to attract shared-pair electrons towards itself
  5. 17. Earth Metal any of the divalent strongly basic metals of Group 2 of the periodic table comprising beryllium (Be), magnesium (mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)
  6. 19. Repulsion Fundamental principle stating that like charges repel each other
  7. 20. Property a characteristic of a particular substance that can be observed during or after a chemical reaction; a quality that can be established only by changing a substance's chemical identity
  8. 22. Property Physical property, such as mass, length, and volume,that is dependent upon the amount of substance present
  9. 23. Trend Specific pattern in the chemical and physical properties of elements that you can see as you move across or down the periodic table
  10. 24. Element A diatomic element is an element that cannot exist by itself as a single atom in nature. Instead, these atoms always pair up in twos to form a stable, two-atom molecule (X2) through covalent bonding
  11. 25. An element that has physical and chemical properties of both metals and nonmetals
  12. 27. Phenomenon where inner-shell electrons block or "shield" outer-shell (valence) electrons from feeling the full positive pulling power of the nucleus
  13. 28. Elements that are generally gases or dull, brittle solids that are poor conductors of heat and electricity
Down
  1. 1. Property Physical property that remains the same no matter how much of a substance is present
  2. 2. Charge Total positive charge in the nucleus of an atom
  3. 4. Property Observable characteristic of matter that can be used to identify particular materials
  4. 5. Metal Any of various metallic elements such as chromium (Cr), iron (Fe), and nickel (Ni) that have valence electrons in two shells instead of only one
  5. 6. The relative capacity of an atom, molecule, or ion to undergo a chemical reaction with another atom, molecule, or compound
  6. 7. Any of the chemical elements fluorine (F), chlorine (Cl), bromine (BA), iodine (I), and astatine (At)
  7. 9. An element that is solid at room temperature, a good conductor of heat and electricity, and generally is shiny; most metals are ductile and malleable
  8. 11. Table An organizational chart of all the known elements on Earth, organized based on the physical and chemical properties of each
  9. 12. Data that supports a hypothesis or an argument and is observable through the senses or technology
  10. 14. Metal any of the six chemical elements that make up Group 1 (Ia) of the periodic table comprising lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr)
  11. 15. Radius the radius of an atom; the shortest distance between the atom's nucleus and the outermost shell of the atom
  12. 16. Energy The amount of energy required to remove an electron from an isolated atom or molecule
  13. 18. A horizontal row of elements in the modern periodic table
  14. 21. A pure substance that is made up of one type of atom
  15. 26. Radius Size of an atom after it has gained or lost electrons