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1st Semester Vocab.

20 words and definitions

Atom a part of a particle considered to be irreducible constituent of a specified system.
Element A fundamental, essential or irreducible constituent of a composite entity.
Nucleous the center of an atom
Electron Shell a grouping of electrons surrounding the nucleus of an atom
Proton a stable, positively charged subatomic particle in the Baryon family
Neutron an electrically neutral subatomic particle in the Baryon family
Electron A stable subatomic particle which and has a negative charge
Atomic Number The number of protons in an atomic nucleous
Atomic Mass the mass of an isotope of an element in atomic mass units
Valence Electron an electron in the outer shell of an atom
Nonmetals any element that lacks the physical and chemical properties of a metal
Metal any electro positive element that usually has a shiny surface and good conductors of heat
Metalloid a nonmetallic element that has some of the chemical properties of a metal
Group a column in the periodic table in which elements are placed with the same properties
Period Horizontal rows in the periodic table that represents the number of electron shells in that row
Transition Elements elements whos atoms have an incomplete sub-shell
Representative Elements elements in the first two groups and the last six of the periodic table
Ion an atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more electrons
Isotope one of two or more atoms having the same atomic number but a different mass number
Law of Conservation of Mass matter can't be made nor destroyed, it can only be changed physically
Created by: k1212090



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