Across
- 3. Neutral particle found in the nucleus
- 5. Electrons in the outermost energy level
- 8. The smallest unit of matter that keeps the properties of an element
- 14. The closest area to Earth where Hydrogen is undergoing fusion
- 15. Atoms of the same element with different numbers of neutrons
- 16. A bond formed between two non-metals
- 17. An atom that has gained electrons
- 19. A chart that organizes all known elements
- 20. A charged atom
- 21. The center of an atom
- 22. Very large stars that explode at the end of their lives
Down
- 1. The process where smaller atomic nuclei combine to form larger ones
- 2. The number of protons in an atom
- 4. Negatively charged particle that moves around the nucleus
- 6. The first and simplest element to exist in the universe
- 7. A group of atoms bonded together
- 9. A massive explosion that forms elements heavier than iron
- 10. The total number of protons and neutrons in an atom
- 11. The horizontal rows of the periodic table that show energy levels
- 12. Positively charged particle found in the nucleus
- 13. An atom that has lost electrons
- 14. Where fusion happens and new elements are formed
- 18. A bond formed between a metal and a non-metal
- 23. The vertical columns of the periodic table that show valence electrons