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atoms questions and answers
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Exam of 2 pages for the course Atom at Atom (atoms questions)
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atoms questionswhat are the three subatomic particles - answer neutrons protons electrons
why do different elements exist - answer they have different number of protons
where is most of the mass of an Atom - answer nucleus
what can the elements atomic number and mass number determine - answer protons
neutrons and electrons
how are isotopes chemically alike - answer identical numbers of protons and neutrons
what are all elements composed of - answer tiny invisible particles
Who is JJ Thomson - answer in English physicist who discovered the electron
what were Thomson's experiments - answer involves passing electric currents to gases
at low pressure in a cathode ray tube
what was the result of Thomsons experiments – answer hey glowing beam or cathode
ray the traveled from the Cathode to the anode
what is the cathode ray deflected by - answer A magnet and electrically charged plates
what did Thompson to conclude - answer A cathode ray is a stream of electrons
what is the plum putting model – answer JJ Thompson and others supposed the Adam
was filled with positively charged material and the electrons were evenly distributed
throughout
what was Rutherford's gold foil experiment - answer in 1911 Rutherford and his
coworkers at the University of Manchester England directed a narrow beam of alpha
particles and a very thin sheet of gold foil
what is Rutherford's atomic model - answer Rutherford concluded that the Adam is
mostly empty space all the positive charge and almost all of the mess were
concentrated in a small region called the nucleus
what is the mole of any substance - answer contains Avogadro's number of 6.02×10 to
the 23rd representative particles
what can the representive particles be - answer formula units Atoms molecules or ions
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