Which of the following statements about the atomic theory of ...

[vicky]

Which of the following statements about the atomic theory of matter is true?
  Einstein helped prove the atomic theory by explaining x-ray production in 1905.
  The atomic theory of matter was universally accepted at the end of the nineteenth century.
  Proust put forth the law of definite masses, saying that a compound is made up of numbers of atoms so that the total of each element has equal mass.
  Dalton proposed that atoms of each element have characteristic properties.
  Atoms were originally thought of as particles, but the work of Dalton and Brown helped prove that atoms were waves.

Question 2

Which of the following statements shows the electromagnetic force at work?
 

A stable nucleus of 4 protons and 5 neutrons
  A rubber band stretching but not breaking
  Beta decay of ¹³⁹Ba
  Collapse of a star into a black hole
  Quarks attracted to one another within a proton

[jennafosdick]

Answer to Question 1

Called the father of atomic theory, Dalton's theories of molecules and different elements in proportion led the charge towards accepting the concept of the atom.

Answer to Question 2

Electromagnetic forces bond molecules together and keep them from separating. A rubber band stretches but does not separate due to bonding, or from a physics perspective, distribution of charges.

[vicky]

Gracias!

[31809pancho]

TYSM