Chemistry: Atomic Structure

Chemistry

Atomic Structure

A)     Describe protons, neutrons and electrons in terms of relative charge and mass

Particle	Relative Mass	Charge	Position in atom
Proton	1	1+	Nucleus
Neutron	1	0	Nucleus
Electron	1 / 2000	1-	Orbiting nucleus

B)      Define ions and isotopes

Isotope: different atomic forms of the same element, which will thus have the same number of protons and electrons but different numbers of neutrons.

Ion: Atoms that have gained or lost electrons and are represented with their charge.

C)      Define and calculate relative atomic and isotopic masses

Relative Isotopic Mass: Mass of one isotope of an element relative to 1/12 the mass of carbon-12

Relative Atomic Mass: The average mass if an atom of an element relative to 1/12 the mass of carbon-12.  Is calculated by:

         [(% x isotopic mass) + (% x isotopic mass) + (% x isotopic mass)] / 100