Topic: Periodic Table of Elements

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Across
  1. 1. All the transition elements are __________.
  2. 4. Kr is the symbol for __________.
  3. 5. Group 1 elements such as lithium (Li), sodium (Na), potassium (K) and __________ (Rb) also known as alkali metals.
  4. 8. The oxides of elements in Period 3 change from basic to __________ and to acidic across a period from left to right.
  5. 9. The ability of being oxidizing agent __________ going down the Group 17 of Periodic Table.
  6. 11. Symbol of astatine.
  7. 13. A period is the __________ row of elements in the Periodic Table.
  8. 16. Antoine Lavoisier became the first chemist who classified the elements into __________ group(s).
  9. 17. Special characteristics of transition elements are form complex ions, show variable oxidation states, acts as catalysts and form __________ ions or compounds.
  10. 19. Symbols of __________ is Cs, meanwhile francium is Fr.
Down
  1. 2. Henry J. G. Moseley discovered the concept of __________ number.
  2. 3. Element X has electron arrangement 2.8.1. Where are the element X placed in the Periodic Table of Elements?
  3. 6. Process where Iron is used as a catalyst in the manufacture of ammonia.
  4. 7. Symbol of Argon.
  5. 10. All elements in Group 17 also known as halogens.
  6. 12. The standard representation of the potassium atom, K is K. What is the correct placement for potassium in the Periodic Table?
  7. 14. The electronegativity of elements will __________ in going across a period from left to right.
  8. 15. Na is the symbol for __________.
  9. 18. Element that used to treat cancer because it is radioactive.