Across
- 3. Atoms that have the same number of protons but different numbers of neutrons are called what?
- 6. A weighted average mass of the atoms in a naturally occurring sample of the element is called what?
- 7. Negatively charged subatomic particles are called what?
- 9. Group A elements are these because they exhibit a wide range of both physical and chemical properties.
- 12. Positively charged subatomic particles are called what?
- 13. Horizontal rows of the periodic table is what?
- 14. These have a high electrical conductivity and a high luster when clean.
- 15. This beam, which traveled from the cathode to the anode, is called what?
Down
- 1. Vertical column of elements in the periodic table is called a what?
- 2. Subatomic particles with no charge but with a mass nearly equal to that of a proton is called what?
- 4. The total number of protons and neutrons in an atom is called a what?
- 5. Defined as one-twelfth the mass of carbon-12 amu is what?
- 8. When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties is called what?
- 10. An arrangement of the elements according to similarities in their properties is called a what?
- 11. The number of protons in the nucleus of an atom is called what?