Atomic Theory

123456789
Across
  1. 2. (3 words)developed by Niels Bohr in 1913, revolutionized our understanding of atomic structure
  2. 3. the smallest unit of an element that maintains its chemical properties
  3. 4. (two words)differs from alpha and beta decay as it doesn't change the atomic number or mass
  4. 6. (two words)represents the number of protons in its nucleus
  5. 7. (two words)happens when a neutron in the nucleus transforms into a proton, releasing an electron (beta particle) and an antineutrino
  6. 9. atoms of the same element that have the same number of protons but different numbers of neutrons
Down
  1. 1. (two words)the electrons in the outermost shell of an atom
  2. 3. (two words)occurs when an unstable atom releases an alpha particle (two protons and two neutrons) from its nucleus
  3. 5. (two words)can hold a specific number of electrons, and electrons can move between these levels by absorbing or releasing energy.
  4. 8. (two words)the total mass of protons, neutrons in an atom