Atoms and Elements

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Across
  1. 2. an atom that has the same number of protons ( or same atomic number) as other atoms of the same element do but has different number of neutrons ( and thus has a different atomic mass)
  2. 3. One of the elements of group 17 of the periodic table
  3. 7. an element that is shiny and that conducts heat and electricity well
  4. 9. metal-harder, denser, stronger, and have higher melting points than alkali metals. One of the elements of group 2 of the periodic table
  5. 11. an element or compound that conducts electric current better than an insulator does but not as well as a conductor does
  6. 14. an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge
  7. 15. a horizontal row of elements in the periodic table
  8. 16. the sum of the numbers of protons and neutrons in the nucleus of the atoms
  9. 17. A vertical column of elements in the periodic table, elements in a group share chemical properties.
  10. 19. subatomic particle that has a negative charge
  11. 21. a region in an atom where there is a high probability of finding electrons
  12. 23. an electron that is found in the outermost shell of an atom that determines the atom’s chemical properties
Down
  1. 1. an element of that conducts heat and electricity poorly
  2. 4. the number of protons in the nucleus of an atom
  3. 5. a unit of mass that describes the mass of an atom or molecule; it is exactly ½ the mass of a carbon atom with a mass number 12.
  4. 6. an atoms central region, which is made up of protons and neutrons
  5. 8. metal One of the metals that can use the inner shell before using the outer shell to bond
  6. 10. The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12 g of carbon -12
  7. 12. a subatomic particle that has a positive charge and that is located in the nucleus of an atom.
  8. 13. gas One of the elements of group 18 of the periodic table
  9. 18. a unit or quantum of light
  10. 20. metal- soft and shiny and reacts violently with water. One of the elements of group 1 of the periodic table
  11. 22. A subatomic particle that has no charge and that is located in the nucleus of an atom