Html viewer was selected to open .htm files and that would not handle mailto: and other links. This app reset that and then next time I opened the file it asked what app to use and I could select Browser (or Chrome). Perfect. At times, I want to use Chrome to open an .html file that I put on my tablet.
Neutrons have a mass of 1.675 Ã 10-24g, which is a little heavier than the proton. Neutrons are 1839 times heavier than electrons. Like all hadrons, neutrons are made of quarks. A neutron is made of two down quarks and one up quark. One up quark has a charge of +2/3, and the two down quarks each have a charge of -1/3.
This unit is actually not the mass of a proton or neutron in grams but is a mass ratio based on the element carbon. An amu is defined as 1/12 of the mass of a carbon atom. Proton...Protons have a positive charge. The number of protons in a nucleus determines the identity of the atom (element) and this number is called the atomic number. The actual mass of a proton has been determined to be 1.673 x 10-24 gram. Scientists use the metric system of measurement where the standard unit for mass is the gram.