Chapter 5: The Periodic Law

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Across
  1. 3. A general direction in which something is developing or changing.
  2. 7. Block that contains the elements of Lanthanides and Actinides.
  3. 9. A negative ion.
  4. 11. An arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group.
  5. 12. The 14 elements with atomic numbers from 90 (Thorium, Th) to 103 (Lawrencium, Lr)
  6. 16. devised the periodic classification of the chemical elements, in which the elements were arranged in order of increasing atomic weight.
  7. 20. Group 2, consists of Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra).
  8. 24. Metals Group 1, consists of Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).
  9. 25. The 14 elements with atomic numbers from 58 (Cerium, Ce) to 71 (Lutetium, Lu)
  10. 26. Group 18, consists of Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).
  11. 28. Appearing or occurring at intervals.
  12. 29. Any process that results in the formation of an ion.
  13. 30. The energy change that occurs when an electron is acquired by a neutral atom.
Down
  1. 1. The physical and chemical properties of the elements are periodic functions of their atomic numbers.
  2. 2. devised the periodic table in which the elements were arranged in increasing order of nuclear charge.
  3. 4. Element that has the smallest atomic radius.
  4. 5. Element that is the most electronegative.
  5. 6. The s-block and p-block elements together are called.
  6. 8. A positive ion.
  7. 10. The electrons of the outer shell which are available to be lost, gained, or shared in the formation of chemical compounds.
  8. 13. The energy required to remove one electron from a neutral atom of an element.
  9. 14. A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound.
  10. 15. One-half the distance between the nuclei of identical atoms that are bonded together.
  11. 17. Consists of the elements in Groups 3-12.
  12. 18. Block that contains the elements in Groups 3-12.
  13. 19. Element that has the largest atomic radius.
  14. 21. Block that contains the elements in Group 1 and Group 2.
  15. 22. An atom or group of bonded atoms that has a positive or negative charge.
  16. 23. Group 17, consists of Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
  17. 27. Block that contains the elements in Groups 13-18.