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5.The positively charged particles in an atom.
6.The number of protons in a given element. (2 Words)
9.From Group 13 and is very reactive and they have three valence electrons. (2 Words)
10.Smallest particle an element can be divided into and still retain the properties of that element.
12.an electon that is found in the outermost shell of an atom and determines that atom's chemical properties and reactivity. (2 Words)
14.The weighted average of all the naturally occurring isotopes of that element. (2 Words)
16.An atom that has gained one or more elctrons producing a negative charge.
17.A tiny and extremely dense positively charged area in an atom.
18.A Danish scientist who studied the way that atoms reacted to light. (2 Words)
25.The ions that make up an ionic compound bonded in a repeating three-dimensional pattern. (2 Words)
27.The negatively charged particles inside an atom.
33.An Austrian physicist and a German physicist who said that electrons do not travel in definite paths by in regions called electron clouds. (4 Words)
38.Experiment designed by Rutherford in order to study the parts of an atom. (3 Words)
39.What an unstable atom is after having it's nucleus changed.
40.How Thomson described his atomic theory model. (2 Words)
41.From Group 17 and is very reactive and has seven valence electrons.
42.Number of families on the Periodic Table.
1.From Group 14 and reactivity depends on the element and have four valence electrons. (2 Words)
2.British chemist and teacher who wanted to know why elements combine in certain proportions. (2 Words)
3.The number of forces giving an atom its stucture and properties.
4.From Group 18 and is unreactive because it has a full outer shell of eight valence electrons except for Helium which has two. (2 Words)
5.A table that organizes all known elements according to atomic number and various other chemical and physical properties. (2 Words)
6.From Group 1 and are the most reactive of all the elements having one valence electron (Two words). (2 Words)
7.Is usually made out of two or more atoms joined in a defined ratio.
8.The sum of the number of neutrons and protons in an atom. (2 Words)
11.Word that "atoms" was derived from; means "not able to be divided".
13.Former student of Thomson's. (2 Words)
15.Consists of Groups 3-12 and are less reactive than both Groups 1 and 2 and have either one or two valence electrons. (2 Words)
19.An atom that has lost one or more electrons producing a positive charge.
20.An atom that has gained or lost neutrons.
21.Where electrons are located according to Schrodinger and Heisenberg. (2 Words)
22.From Group 15 and reactivity depends on the element and have five valence electrons. (2 Words)
23.From Group 2 and are less reactive than Group 1 having two valence electrons rather than one. (2 Words)
24.From Group 16 and is reactive and has six valence electrons. (2 Words)
26.A Russian chemist who discovered patterns to the elements and catagorized them according to different properties such as density, appearance, and melting points. (2 Words)
28.A British scientist who arranged the elements based on their atomic number. (2 Words)
29.Forms when valence electrons are transferred from one atom to another atom. (2 Words)
30.Is the joining of atoms to form new substances. (2 Words)
31.Is a bond formed by the attraction between positively charged metal ions and the electons around the ions. (2 Words)
32.Number of periods on the Periodic Table.
34.Forms when atoms share one or more pairs of electons. (2 Words)
35.British scientist who discovered even smaller particles inside an atom.
36.The particles of an atom without a charge.
37.Is the most abundant element in the universe and has one valence electron and is explosively reative with oxygen.

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