SCHEDULE CHANGE. A planned change or a flight number/time change which can occur up to more than 72 hours prior to the flight's scheduled. departure. Examples - Change of flight times, change of flight numbers, reduction of service, discontinuation of all service. in a market. American uses an automated schedule change process up to 72 hours prior to departure. Through this automated. process all schedule changes are sent to the booking source for notification.
Describe the particles that make up the nucleus of an atom in terms of mass and charge. Protons, neutrons and electrons. Protons have a relative mass of 1 and a charge of +1, they are found in the nucleus of an atom.
everything is made up of atoms. Atoms consist of the. nucleus and negatively charged particles surrounding. the nucleus called electrons. Inside of the nucleus. are protons(positively charged particles)and neutrons. neutral particles). If the atom is not an isotope we. know that there must be an equal amount of protons and. neutrons. We also know that there has to be at least. one proton and one neutron inside of the nucleus.