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Across 2. atoms in the same _______ have the same number of valence electrons 4. elements with large ionization energies are in the upper ______ corner of the PToE 6. To find the number of neutrons in an atom, ________ the atomic number from the mass number and round 7. an element in the lower left corner of the PToE has a large atomic _________ 9. the size of the nucleus (in terms of volume) compared to the entire atom 11. the most electronegative element on the periodic table 12. the transition metals have partly filled ________ (two words) 17. the electrons in the outermost shell (highest unfilled energy level) 19. electrons have this charge 20. these gases don't react with other elements 21. atoms that have the same number of protons but different number of neutrons 22. tiny particles from which all elements are made

Down 1. the atomic number is a measure of how many of these are in an atom's nucleus 3. In electron configurations, the "s" in 1s2 5. these elements have 7 valence electrons 8. these elements are neither metals nor non-metals 10. the ________ number is the number of protons and neutrons in a nucleus 13. alkaline earth metals are in the _________ column of the Periodic Table of Elements 14. lithium is found in this group, the ______ metals 15. this element has the same number of valence electrons (and number of dots in a Lewis dot diagram) as magnesium or beryllium 16. a charged atom or small molecule 18. the number of electrons in a filled outer shell