Atomic Structure Unit 3 (Suhail)

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Across
  1. 1. Smallest particle of an element that has the properties of that element.
  2. 5. Sum of protons and neutrons.
  3. 7. Region around the nucleus where electrons can be present, Holds energy levels in it.
  4. 9. Region around the nucleus in an atom where electrons can be found.
  5. 10. Negatively charged subatomic particle.
  6. 12. Atoms of same element with same atomic number but different mass number.,
  7. 14. Path around the nucleus, with definite amount of energy, in which electrons revolve.
  8. 15. Positively charged atom or group of atoms.
  9. 16. Core of an atom where mass and positive charge lies. It holds protons and neutrons.
  10. 17. Negatively charged atom or group of atoms
  11. 18. Paths around the nucleus in which electrons revolve.
  12. 19. Vertical column in the periodic table of elements
  13. 21. atomic mass unit, Unit to express atomic or molecular mass. Equal to 1/12th of C-12 atom
Down
  1. 1. Number of protons inside the nucleus of an atom. It is unique to each element.
  2. 2. Present inside the nucleus and has zero charge.
  3. 3. a table that arranges the chemical elements into rows and columns.
  4. 4. Arrangement of electrons in the energy level out side the nucleus of an atom.
  5. 6. Electrons present in the outer most energy level
  6. 8. Positively charged subatomic particle present inside the nucleus.
  7. 11. Average of the atomic masses of all the isotopes of an element that occur naturally.
  8. 13. Charged atom or groups of atoms.
  9. 20. horizontal row in the periodic table of elements