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Unit B-2

Structure of Matter

QuestionAnswer
Element A substance consisting of atoms which all have the same number of protons
Mass number The total number of protons and neutrons (together known as nucleons)
Solid Firm and stable in shape
Atomic Number The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Liquid Having a consistency like that of water or oil
Neutron a subatomic particle of about the same mass as a proton but without an electric charge
State of Matter Is one of the distinct forms that matter takes on.
Valence Electron Is an electron that is associated with an atom
Reactivity The state or power of being reactive or the degree to which a thing is reactive.
Gas An air like fluid substance which expands freely to fill any space available, irrespective of its quantity.
Electron cloud The system of electrons surrounding the nucleus of an atom.
State of Matter Is one of the distinct forms that matter takes on. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.
Atom The basic unit of a chemical element.
Proton A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
Nucleus The central and most important part of an object, movement, or group, forming the basis for its activity and growth
Electron A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Periodic Table of Elements A tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties.
Atomic Mass The mass of an atom of a chemical element expressed in atomic mass units.
Created by: pmaclin35