Flashcards in Chapter 3B Deck (21)
Who was the Greek philosopher who began the search for a description of matter more that 2400 years ago?
In 1897, who was an English scientist that provided the first hint that an atom is made of even smaller particles (electrons).
Who won the Nobel Prizes in Chemistry and Physics for the discovery of Ra and Po, and the phenomenon of radiation ?
Who concluded that atoms had a hard center (nucleus) and are mostly empty space, and discovered 3 different types of radioactive particles.
In the early 1800’s what English chemist performed a number of experiments that eventually led to the acceptance of the idea of atoms?
Who did the preliminary work for the discovery of radiation?
Antoine Henri Becquerel
What term mean the time it takes for half of an amount of a radioactive substance to decay?
What is the term for the number of protons in an atom?
What is the term for when a radioactive atom splits into two?
What is the term for atoms that have the same number of protons but different number of neutrons?
What is the term for particles that are located in the nucleus of the atom (protons and neutrons)?
What is the term that shows the radioactive decomposition of an element?
What is the term for the number of protons and neutrons?
What is the term for the process by which the nuclei of atoms emit particles and rays?
What is the ter for each unique atom?
What is the term for two nuclei combine to produce a nucleus of heavier mass accompanied by the release of a large amount of energy?
What is the term for a self-sustaining sequence of nuclear fission reactions?
Nuclear chain reaction
What is the term for the penetrating rays and particles emitted by a radioactive source?
What is the term for the minimum mass of fissionable material required to generate a self-sustaining nuclear chain reaction?
Be able to identify the atomic models and identify their parts
See Mrs. Krumpelman for help