Tuesday, October 25, 2016
Tuesday, October 18, 2016
As understanding of atoms increased, different experiments resulted in the discovery of the particles that of which an atom is made. Thompson is credited with first realizing that the atom is made of particles, some negatively charged and some positively charged. Rutherford was credited with identifying that the positive charge is located within a central, relatively dense nucleus. Later, in 1932, James Chadwick designed an experiment to show that neutrally charged particles also existed in atoms—neutrons.
Symbol: p+Relative mass: 1Actual mass: 1.674 X 10^-24
Saturday, October 15, 2016
Understanding what things were made of goes back far into history. The ancient Greeks had ideas and debated as long ago as 2500 years.