Across
- 2. The small, positively charged center of an atom, contains protons and neutrons.
- 5. Weighted-average mass of an element’s isotopes according to their natural abundance.
- 8. Organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties.
- 10. Particle in the nucleus with an electric charge of +1.
- 11. Horizontal row in the periodic table.
- 13. Uses the symbol for an element and dots representing the number of electrons in the element’s outer energy level.
- 14. Particle of matter that makes up protons and neutrons.
Down
- 1. Area around the nucleus of an atom where the atom’s electrons are mostly likely to be found.
- 3. Vertical column in the periodic table.
- 4. Electrically neutral particle inside the nucleus of an atom.
- 5. Number of protons in an atom’s nucleus.
- 6. The smallest particle of an element that still retains the properties of the element.
- 7. Particle with an electric charge of -1, surrounds the nucleus of an atom.
- 9. Atom of an element that has a specific number of neutrons.
- 12. Sum of the number of protons and neutrons in an atom’s nucleus.