Term | Definition |
Atomic Mass | Average mass of one atom of an element. |
Periodic Table | A chart where all evidence is organized in periods and groups. |
Chemical Symbol | One or two letter code that stands for an element. |
Period | A row of elements in the periodic table arranged by atomic number. |
Group | A column of elements in the periodic table, in which elements have certain properties in common. |
Matter | The material that all objects and substances are made of. |
Element | Subtances that are the building blocks of all matter. |
Compound | Matter made of two or more elements. |
Atom | Smallest particle into which an element can be divided and still have properties of that element. |
Electron | Negatively charged particle found outside the nucleous of an atom. |
Nucleus | Structure near the center of a cell that contains the cells DNA. |
Proton | A small, positively charged particle in the nucleus of the Atom. |
Neutron | A cell that carries information through the nervous system. |
Energy level | The amount of energy carried by an electron in an atom. |
Isotope | Atoms of the same element with different number of neutrons in the nucleus. |
Mass Number | The sum of protons and neutrons in the nucleus of an atom. |
Atomic Number | Number of protons in the nucleus of one atom of an element. |
Metal | Elements, usually solid, with shiny surface. |
Malleable | A term used to describe material. |
Ductile | Material that can be pulled out into a long wire. |
Conductivity | Transfer of heat from a warmer substance to a cooler substance through direct contact. |
Reactivity | The state or power of being reactive or the degree to which a thing is reactive. |
Corrosion | Some metal react with oxygen in the air. |
Akali Metal | A group of elements in group 1. |
Allkaline Earth Metal | An element in group 2. |
Transition Metal | Element in group 3. |
Alloy | A mixture of one or more elements. |
Nonmetal | An element that lacks most of the properties. |
Diatomic Molecule | A molecule consisting of two atoms. |
Halogens | Elements in group 7A. |
Nobel Gases | Elements in group 18. |
Metalloid | Element that has some characteristics of both metal and nonmetal. |
Semi Conductor | A substance that can conduct electricity. |