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Across 4. The number of protons in the atom (2 Words) 5. The number of shells in an element from period 3 9. Negatively charged particles 11. The number of outer electrons in an element of group 4 12. Where most of the mass of the atom is concentrated 14. Where the electrons are

Down 1. Particles have no charge 2. The table where the elements are arranged in order of atomic number (2 Words) 3. Atoms are this because they have an equal number of positive protons and negative electrons 4. The number of protons and neutrons in the atom (2 Words) 6. Positively charged particles 7. Protons and neutrons have this mass 8. Horizontal rows in the periodic table 10. Vertical columns in the periodic table 13. The approximate mass of an electron