Chemistry

1. A positively charged ion.
5. The generic term given to elements that are brittle and dull.
10. Elements that have a different number of neutrons.
11. A negatively charged ion.
12. The name of the elements in group 1.
15. A negatively charged particle.
17. This group is the most reactive and includes fluorine.
20. The _____ number changes because isotopes have varying amounts of neutrons.
24. Any particle that contains a charge.
25. Electrons in the outermost shell of an atom.
28. _______ Metals are the given name to this group of elements that have 2 ve- and a +2 charge.
29. These metals solely make up the f-block.
30. The new substances formed as a result of a chemical reaction.
31. The elements that are located in 3A.

2. _____ Metals that make up the d-block.
3. The center of an atom that is positively charged.
4. A positively charged particle.
6. These elements have the group number 16.
7. An element's _____ is based on how many electrons it gains or loses.
8. The name of this non-reactive group, full octet.
9. Only a select few elements are lucky enough to have characteristics of metals and nonmetals.
13. The generic term given to elements that are ductile and malleable.
14. The branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions.
16. A substance formed when two or more elements chemically combine in fixed ratios.
18. A substance that increases the rate of a chemical reaction without itself being consumed in the process.
19. The area outside of the nucleus where the electrons reside.
21. A particle without a charge, electrically neutral.
22. The substances present at the beginning of a chemical reaction that undergo change to form products.
23. A process in which substances undergo chemical changes to form new substances.
26. A pure substance made up of only one type of atom, characterized by its unique atomic number.
27. The name of the elements that have 5 valence electrons