science

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Across
  1. 4. / Non-metals in group 17 in the periodic table, fluorine,chlorine, bromine and iodine.
  2. 6. / Positively charged centre of the atom made up of protons and neutrons.
  3. 7. / The element in group 8 and period 4.
  4. 8. / The third most abundant element in the cosmos,after hydrogen and helious.
  5. 9. / A soft, silver-white metal belonging to the alkali metal group of chemical element.
  6. 12. / The first of the synthetic element.
  7. 13. / Charged particle made up of several non metallic atoms joined together.
  8. 14. /_____for removing and holding a hot beaker.
  9. 18. / ____are used to pick up small object.
  10. 20. / Compound produced in a neutralization reaction between an acid and a base.
  11. 22. / ....mixture is one that has uniform composition and the same properties throughout the mixture.
  12. 24. / Ability of a substance to conduct heat,sound or electricity.
  13. 25. / Determined without destroying matter.
  14. 28. / an alkaline battery.
  15. 29. / Type of bond formed when electrons transfer between metals and non-metals.
  16. 30. / The largest naturally occuring element.
Down
  1. 1. / A substance that cannot be broken down into simpler components by any non-nuclear chemical reaction.
  2. 2. / Poor conductor of heat.
  3. 3. / an posotively charged ion.
  4. 5. / The element that has atomic number 32.
  5. 10. / Unreactive with all, but the most corrosive of acids.
  6. 11. / The element in group 3 to 12 are referred to as ...
  7. 15. / ____ is pH changes very little when a small amount of strong acid or base is added to it.
  8. 16. / an element is defined by the nucleon number, which is the sum of the number of protons and the number of neutrons in the atomic nucleus.
  9. 17. / substances that, in aqueous solution, are slippery to the touch, taste astringent, change the color of indicators (e.g., turn red litmus paper blue),
  10. 19. / Chemical reaction in which an acid and a bases react quantitatively with each other.
  11. 21. / Chemical combination of two or more elements.
  12. 23. / ____is any chemical element which has properties between those of metal and non-metal.
  13. 26. / A change in the physical and chemical properties.
  14. 27. / a subatomic particle with a positive electric charge of +1e.