Definition
What is the definition of an electrode?
What is a conductor through which electricity enters or leaves an object, substance, or region.
What did scientists find that corresponded to the number of electrons in an atom?
What is an atomic number.
Who thought matter was made pf particles in the 17th century.
What is Isaac Newton?
What is the phenomenon which allows nuclear weapons to be so destructive?
What is fission and fusion?
What is E=mc2?
What explains that matter can be converted to energy and energy can be converted to matter
Definition of an Atom
What is the smallest unit of matter that has the characteristic properties if a chemical element.
What did J J Thomson discover in 1897?
What are electrons near the edge of an atom.
Who formally stated that everything is made of tiny atoms?
What is John Dalton?
What was used to see the first electrons?
What is an electron microscope.
Protons and neutrons are in the center and electrons are on the outside.
What two parts of the atom weigh almost exactly the same?
What are protons and neutrons.
What are most of the atom is made of?
What is empty space.
Who grouped the elements into periods according to their chemical properties?
What is Dmitri Mendeleev?
What are 2 most common isotopes used in nuclear weapons?
What are Plutonium 239 Uranium 235.
What does an atom do?
Atoms join together to form molecules, and make up the objects around us.
What is an alpha particle?
What is a helium nucleus made from 2 protons and two neutrons: given out by some radioactive nuclei when they decay.
Where is the positive charge of an atom concentrated in?
What is the tiny nucleus.
Who showed that cathode rays were a stream of electrons?
What is J J Thompson.
Why do scientists try to find smaller and smaller particles?
What is scientists wanting to reduce the number of fundamental particles.
What is a cathode ray tube?
What is a high vacuum tube that produces a luminous image on a florescent screen.
The nucleus has a _____ due to the electrons minuscule weight?
What is a large mass.
Who created the first particle model?
What is John Dalton.