Discovering Parts of the Atom

Decide whether the item on the left or right is larger or smaller. Larger item is on the left atom or neutron nucleus or proton atom or electron nucleus or neutron proton or quark Larger item is on the right quark or neutron nucleus or atom electron cloud or atom electron or nucleus proton or atom How has the atomic model changed over time? Match the events with the scientist responsible. Democritus challenges the popular idea that matter is made of fire, water, air, and Earth. J.J. Thompson investigates the electrical charge of atoms Niels Bohr investigates the energy level of atoms students of Ernest Rutherford conduct the gold foil experiment John Dalton finds evidence to support the theory that all matter is made of atoms that cannot be divided, created, or destroyed James Chadwick discovers that in addition to protons, the nucleus also contains neutrons Matching Match the word with the definition. electron particle with one negative charge atom the smallest particle of an element that still represents that element proton particle with one positive charge neutron neutral particle found in the nucleus Label the diagram. Label the image below. electron neutron proton Brain Pop Atomic Model Log into your McGraw Hill textbook and watch the Brain Pop video Atomic Model and complete the questions below. You should get all of these questions correct since they give you the correct answer when you complete the online quiz. Brain Pop: About how big is an atom? size of a brain cell one ten-millionth of a millimeter the size of a grain of sand Brain Pop: What words do we use to describe the charge of a particle? on and off positive and negative magnetic and normal Brain Pop: What does the nucleus of an atom contain? protons and neutrons neutrinos and electrons DNA Brain Pop: The particles that move around the nucleus are called: photons bambinos electrons Brain Pop: How do electrons move around the atom's nucleus? they come and go as they please in neat planet-like orbits in the electron cloud Brain Pop: How are electrons arranged in an atom? in groups of five in energy levels by color Brain Pop: What is the inside of an atom mostly made of? empty space electricity particles Brain Pop: Where is most of atom's mass? in the electrons in the nucleus atoms have no mass Brain Pop: What is the status of research on atoms? it is now illegal to research atoms it continues to this day it was completed in 1930 Brain Pop: What type of atom has a nucleus? every atom air molecules metal atoms