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Across 4. Elements with 3 or less electrons in the outer energy level. (2 Words) 5. Atoms of the same elements having the same atomic number but, different atomic mass. 6. Is the ability of a metal to resist a compression. 8. It is the amount of matter in a body. 9. It is distance between two successive crest or toughs. 10. It is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. 11. It is a region inside the potential well where each electron forms a type of three-dimensional standing wave—a wave form that does not move relative to the nucleus. (2 Words) 14. Number of protons in the nucleus of an atom. (2 Words) 16. is an ion with fewer electrons than protons, giving it a positive charge. 17. is a material's ability to deform under compressive stress 18. The ease by which an atom accept an electron to attain stability. (3 Words) 22. It is the horizontal row in the periodic table. 24. Number of protons and neutrons in the nucleus of an atom. (2 Words) 26. a solid material's ability to deform under tensile stress 27. is an ion with more electrons than protons, giving it a net negative charge 28. It is a space occupied by matter. 29. Ability of a solid to dissolved in liquid. 30. All the bound protons and neutrons in an atom make up a tiny atomic nucleus, and are collectively called

Down 1. Bonds formed between 2 different atoms having different electronegativity. (3 Words) 2. It is a bond characterized by equal sharing of electron between two identical atom. (4 Words) 3. It is a vertical column of elements. 7. It is the linkage between atoms formed by sharing of Electros. (2 Words) 12. It is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid. (2 Words) 13. The number of wave passes in every second. 15. Is the ability of a metal to be flattened. 19. Is the temperature at which it changes state from solid to liquid (2 Words) 20. Refers to the height of a wave. 21. It is the time it take for a radioactive substance to decrease the half of its original value. 23. Is the property of a solid to resist compression. 25. A combination of two or more compounds.