Across
- 2. A region in an atom where there is a high probability of finding electrons.
- 4. Elements are arranged by increasing atomic number and by changes in properties
- 5. Transfer of thermal energy by collisions of particles (CONTACT)
- 7. The average kinetic energy of the particles of a substance
- 8. Negatively charged particle that moves around the nucleus of the atom
- 10. A chemical equation that has the same number of atoms of each element on both sides of the equation.
- 14. Transfer of thermal energy by electromagnetic waves
- 15. The minimum amount of energy needed to start a reaction
- 17. The transfer of energy from a higher temperature to a lower temperature
- 18. Atoms of the same element that have different numbers of neutrons
- 21. Transfer of thermal energy in a fluid from one place to another
- 22. Energy The sum of the kinetic and potential energy of the particles in an object
- 24. A chemical reaction in which energy is released.
Down
- 1. Substance that speeds up a chemical reaction without being permanently changed itself
- 3. The energy required to raise the temperature of 1 gram of a substance by 1 degree
- 6. The sum of the number of protons and neutrons in the nucleus of an atom
- 9. An electron that is found in the outermost shell of an atom and that determines the atom’s chemical properties.
- 11. The number of protons in an atom’s nucleus
- 12. A chemical reaction in which energy is absorbed.
- 13. Atomic particle with no charge (neutral) that is part of the atom’s nucleus
- 16. Vertical columns in the periodic table
- 18. A substance that slows down a chemical reaction
- 19. Element or compound that cannot be broken down into simpler components and maintain the properties of the original substance
- 20. Energy Energy a moving object has because of its motion
- 23. Atoms of the same element that have a different number of electrons