CHM 2045C Chapter Notes - Chapter 2: Beryllium, Molar Mass, Magnesium
Document Summary
Ernest rutherford discovered the proton through the rutherford gold foil. 3 subatomic particles: proton (p+), +1 charge, 1. 0073 amu, number of protons identifies an element, electron, e-: 1 charge, . 0005486 amu: neutron, n0, no charge, 1. 0087 amu. Atoms acquire charge (form ions) by gaining or losing electrons: net charge = number of electrons lost (+) or gained (-) The atomic masses and isotope abundances are determined by means of. Mass spectrometer: device generates +ve ions that pass down an evacuated curved path inside a magnet, ions are separated based on the mass/charge ratios (12c+, 4h+, each mass is then calculated. Atomic mass of a carbon-12 isotope is exactly 12 amu. Calculating atomic mass: (% a(cid:271)undan(cid:272)e isotope (cid:1005)(cid:895)/(cid:1005)(cid:1004)(cid:1004) + (cid:894)% a(cid:271)undan(cid:272)e isotope (cid:1006)(cid:895)/(cid:1005)(cid:1004)(cid:1004) et(cid:272). The idea of a unit to denote a specific number of items is not new: 1 dozen donuts = 12 donuts, 1 case = 24 cans. If finding atoms, convert grams to moles, then multiply by.
