Atomic structure flashcards 0.0 / 5 ? ChemistryAtomic structureASAQA Created by: Amjed AliCreated on: 08-04-19 18:27 What are atoms made from? Protons, neutrons, and electrons 1 of 23 What is the charge on an electron? -1 2 of 23 What is the charge on a proton? +1 3 of 23 What is the charge on a neutron? 0 4 of 23 What does the mass number tell? Total number of protons and neutrons in the nucleus 5 of 23 What does a -1 charge show? the ion has 1 more electron 6 of 23 what does a +1 charge show? the ion has 1 less electron 7 of 23 What is an ion? A charged particle 8 of 23 What are isotopes? Atoms of the same elements that have different number of neutrons 9 of 23 What are the relative masses of atoms compared to? carbon-12 10 of 23 What is the relative atomic mass? The average mass of an atom of an element on a scale where an atom of carbon-12 is 12 11 of 23 What is the relative molecular mass? The average mass of a molecule on a scale where an atom of carbon-12 is 12 12 of 23 What is the relative isotopic mass? The mass of an atom on an isotope of an element on a scale where an atom of carbon-12 is 12 13 of 23 What does a mass spectrometer measure? The relative mass 14 of 23 What are the four stages of a mass spectrometer? Ionization, acceleration, ion drift, and detection 15 of 23 What happens in the ionization stage in a mass spectrometer? The sample is ionized through either: electrospray ionization, or electron impact ionization 16 of 23 What is electrospray ionization? Sample dissolved, pushed through small nozzle, high voltage applied, each particle gains a H+ ion 17 of 23 What is electron impact ionization? Sample vaporized and an electron gun is used to fire high energy electrons at it. One electron knocked off each particle, +1 ions made 18 of 23 What happens in the acceleration stage in the mass spectrometer? Positively charged ions are accelerated by an electric field so they all have the same kinetic energy 19 of 23 What happens in the ion drift stage in a mass spectrometer? Ions enter a region with no electric field. They just drift through it. Lighter ions move faster than heavier ions 20 of 23 What happens in the detection stage in a mass spectrometer? Ions that have a lower mass/charge ratio travel faster so detected earlier. Mass spectrum produced 21 of 23 What is a mass spectrum graph? A mass/charge plotted against abundance 22 of 23 What can mass spectrometry be used to identify? elements and molecules 23 of 23
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