Term | Definition |
1 Atom | Smallest particle into which an element can be divided and still
have properties of that element |
2 element | substances that are building blocks of all matter |
3 nucleus | substances that are building blocks of all matter |
4 electron shell | region around the nucleus where an electron may be found |
5 proton | positively charged particle |
6 neutron | particle with a neutral charge |
7 electron | negatively charged particle found in the electron cloud |
8 Atomic number | number of protons in the nucleus of one atom |
9 atomic mass | average mass of one atom |
10 valence electron | elements with a shiny surface |
11 Metal | elements with a shiny surface |
12 Nonmetal | elements solid usually gas or brittle solid at room temp. |
13 metalloid | elements that have characteristics of a metal and non meta |
14 group | a family of elements in the periodic table that have similar
physical/chemical properties |
15 period | a row in the periodic table arranged by atomic number |
16 element | substance that cant be broken down into simpler particles |
17 transition elements | elements in groups 3-12 in the periodic table |
18 representative elements | elements in groups 1 and 2 and 13-18 in the p.t. |
19 ion | atom or molecule that has an overall electric charge |
20 isotope | atoms of the same element that have different number of
nuetrons |