CHM-1045 Lecture 4: lecture 4

• School: FSU
• Department: Chemistry and Biochemistry
• Course: CHM-1045
• Professor: Stephanie dillon

Document Summary

Dalto(cid:374)"s ato(cid:373)ic theory: all matter is composed of indivisible particles called atoms, atoms are indestructible and unchangeable, all atoms of a given element are identical, compounds are formed when atoms of different elements combine. Mass of a starting material must equal the total mass of the product(s) The percentage by mass of the elements in an compound is always the same. Inside the nucleus, 2 particles (protons and electron), and has a positive charge. Outside of the nucleus there is a net negative charge, made from electrons mass = 1. 67 x 10^-27 kg mass = 1. 67 x 10^-27 kg. # of protons is unique for each element. Neutron: an element with differing numbers of neutrons, is an isotope. 0 charge neutrons help define the mass of the atom mass = proton + neutron mass. # of neutrons can be variable in an element. Wednesday september 6th, 2017 mass = 9. 11 x 10^-31 kg.