title: Protons, Neutrons, Electrons and Quarks! Tiny Atoms We Can't See - Science for Kids - Children's Chemistry Books
author:  Pfiffikus 
description: Pfiffikus prides itself in providing its readers with easy to digest information on topics that will surely increase a childs knowledge. Pfiffikus offers a vast collection of topics for learning different subjects and puts the information in a nutshell  from History, to Science and Technology, Environment Awareness to learning different kinds of animals in the Planet. Its colorful graphics will awaken your childs imagination. This is a good way to get your child to learn something new everyday!
zlib_text: i'-
  Raintree Steck-Vaughn
  Illustrated
  @
  SCIENCE
  ENCYCLOPEDIA
  Volume
  17
  PRO - RES
  M
  ^ RAINTREE . -
  STECIGVAIJGHN
  PUBLISHERS
  The Steck-Vaughn Company
  Austin, Texas
  
  PRO
  PROTISTA (pro tis'ta) Protista is a kingdom, in
  the five-kingdom system of classification, that
  includes one-celled organisms called protozoans
  and all algae except blue-green algae.
  See A/so ALT]AL,; CLASSIFICATION OF I,IVING ORGAN-
  ISMSi KINCDOM; PROTOZOA.
  PROTON (pro't6n';All matter consists of very
  tiny particles called atoms. The atom is made up
  of a central core called the nucleus. Around the
  nucleus are particles called electrons. The nucleus
  contains two main kinds of particles: protons
  and neutrons (see ATOM; NUCILEUS). Because the
  proton is smaller than the atom, it is called a sub-
  atomic particle. A proton has a positive electric
  charge. It spins around its own axis like a spin-
  ning ball.
  Physicists used to think that the proton had no
  structure, but they now believe that it does.
  Physicists think that the pr