In this lecture, you will learn how each of these particles was discovered and how the culmination of generations of scientific work ultimately came together to create our understanding of the most fundamental unit of matter: the atom.Atoms are comprised of 3 types of particles called subatomic particles: positively charged protons, negatively charged electrons, and neutrons, which have no charge. Protons and neutrons are of nearly equal mass and reside in a dense nucleus at the center of the atom. But much smaller, negatively charged electrons orbit this nucleus, balancing out the positive charge provided by the protons. Show
ORIGINS OF ATOMIC THEORY
DALTON’S ATOMIC THEORY
DISCOVERY OF THE ELECTRON
DISCOVERY OF THE PROTON
DISCOVERY OF THE NEUTRON
FORMATION OF IONS
Questions1 If negatively charged electrons are attracted to positively charged atomic nuclei, what keeps the electron cloud of an atom or ion from collapsing? 2 How many neutrons, protons, and electrons are in the following atoms and ions? a An atom of plutonium 244 b An oxide ion (O2−) made from oxygen’s most abundant isotope Answers2a) 94 protons, 150 neutrons, 94 electrons; 2b) 8 protons, 8 neutrons, 10 electrons. Taught by Professor Ron B. Davis, Jr., Ph.D Which of the following is not a fundamental subatomic particle that form elements?Positron is not a subatomic particle. Electrons, protons and neutrons are the subatomic particles.
Which of the following is not true about subatomic particles in an atom?Answer and Explanation: The statement that is not true about subatomic particle is that all electrons and atom contain the same amount of energy.
Which of the following is not considered a form of matter?Energy cannot be classified as matter because by definition, matter occupies space and has mass. Energy is a different entity that does not occupy space or has mass.
Which of the following is not a component of an atom?Detailed Solution. Photon is not a part of an atom. They are the subatomic particles with no substructure.
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