Science

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Across
  1. 1. What kind of bonding is called in which one or more pairs of electrons are shared between atoms?
  2. 3. What is the chemical symbol for silver?
  3. 4. Which of the three sub-atomic particles is the lightest?
  4. 5. How many products does a decomposition reaction create *Eg ans. One-Plus-One*
  5. 7. What is the PH level of just plain, pure water? *Without Decimals*
  6. 9. What kind of reaction is the vinger egg reaction?
  7. 11. What is the PH level of rainwater? *Without Decimals*
  8. 12. First name of the person who created the modern-day atomic table?
  9. 13. How many products does a double replacement reaction create
  10. 14. What is an element called when it loses or gains an electron?
  11. 16. How many products does a single replacement reaction create
  12. 17. How many shells do elements have that are placed in the third period of the periodic table?
  13. 19. What is the center of an atom called?
  14. 20. What is the chemical symbol for Mercury?
  15. 21. What is the lightest noble gas?
Down
  1. 2. What is the charge of an electron {Pos or Neg}
  2. 5. How many elements can possibly exist? *Eg ans. Four-Hundred-Twenty-Three*
  3. 6. What is the chemical symbol for Lead?
  4. 8. Name for elements that produce toxic, coloured vapours. And are Highly reactive.
  5. 10. What is the lightest element?
  6. 11. How many neutrons does carbon have?
  7. 13. How many electrons fit in the first energy level of an atom?|
  8. 15. How many products does a synthesis type reaction create
  9. 17. Truth or false, atoms are the smallest unit of matter and combine to form molecules.
  10. 18. What is another name for columns on the periodic table