chemistry exam 1

• who discovered the nucleus of the atom? Ernest Rutherford
• who discovered the electron? J.J Thomson
• who discovered the neutrons?

  sir James Chadwick
• what is dalton known for? Atomic theory, and explains chemical reactions
• what is democritus known for? tiny fundamental particles
• what did Rutherford discover? he discovered alpha and beta rays. and explained the laws of radioactivity decay
• what experiment did rutherford use? Gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.
• what was thomas experiment? High vaccum to see if the virus could be killed.
• who made up the modern day periodic table? Dmitri Mendeleev
• which one is larger fluorine or bromine in atomic radius? bromine
• which one is larger bromine or fluorine in first ionization energy? fluorine
• describe the trend of electronegravity on the periodic table?

  decreases