Periodic Table and Trends

2. The number of protons in one atom of an element.
5. A type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force.
7. An ion that has a positive charge.
8. Element that has properties of both metals and no metals, located along the "stair-step" of the periodic table.
9. when the atom loses or gains electrons to become negatively charged (anions) or positively charged (cations) ions.
10. Group 7A, 7 valence electrons in it's outermost energy level. Very reactive. Gain 1 electron to form negative ions.
14. Elements in group 8A of the periodic table and don't have a charge.
19. The energy needed to remove an electron from a negative ion to form a neutral atom or molecule.
21. Group 2A, 2 valence electrons in outer level. Lose 2 electrons to form positive ions.
22. The distance between the center of identical atoms.
24. An ion that has a negative charge.
25. A stable subatomic particle with a charge of negative electricity.
26. Atoms that have more electrons in their outer energy level and more protons in their nucleus.

1. A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei.
3. Is a chemical rule of thumb that reflects the theory, elements tend to bond in such a way that each atom has eight electrons being the same as a noble gas.
4. the relative capacity of an atom, molecule, to undergo a chemical reaction with another atom, molecule, or compound.
6. The procces of adding or removing electrons.
11. A vertical column of elements in the periodic table; elements in a group share chemical properties.
12. Group B of the periodic table, they are placed in the middle of the periodic table.
13. A horizontal row of elements in the periodic table.
15. a measure of the ability of an atom in a chemical compound to attract electrons.
16. An electron that is found in the outermost shell of an atom.
17. Element solid at room temperature, is not a malleable or ductile, is a poor conductor of heat and electricity. Located on right side of periodic table.
18. The energy required to remove an electron from an atom or ion.
20. Group 1A, 1 valence electron in outer level, very reactive, shiny, low density.
23. Elements that are solid at room temperature; shiny, malleable, ductile; left side of the periodic table; conduct heat and electricity.