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