Across
- 2. number of protons in an atom's nucleus
- 5. the first element on the periodic table
- 8. positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons
- 13. smallest particle of an element that still retains the properties of the element
- 14. organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties
- 17. area around the nucleus of an atom where the atom's electrons are most likely to be found
- 20. elements that are usually a gas or brittle solid at room temperature, not malleable or ductile, are not good conductors of heat and electricity, and are typically not shiny
Down
- 1. particle of matter that makes up protons and neutrons
- 3. particle surrounding the center of an atom that has a charge of 1-
- 4. a nonmetal element with atomic number 5
- 6. horizontal row in the periodic table
- 7. element that shares some properties with metals and some with nonmetals
- 9. vertical row in the periodic table
- 10. elements that are typically hard, shiny, solid, malleable, and are good conductors of heat and electricity
- 11. an element with an atomic mass of 65.38
- 12. neutral particle composed of quarks inside the nucleus of an atom
- 15. a metal element with 77 protons
- 16. particle composed of quarks inside the nucleus of an atom that has a charge of 1+
- 18. a radioactive nonmetal element with 86 protons
- 19. atoms of the same number that have different numbers of neutrons