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Homework Help. Melting Point: 63.65 °C (336.8 K, 146.57 °F) Boiling Point: 774.0 °C (1047.15 K, 1425.2 °F) Number of Protons/Electrons: 19. Number of Neutrons: 20. 121. Well, how many protons are in the [math]^{40}K[/math] isotope? Clearly, there are 19. How many neutrons does potassium have? ----protons -----neutrons --- … It catches fire when exposed to water. ----protons __-_electrons -----neutrons 2)An ion of oxygen has a charge of -2. how many protons, neutrons, and electrons does the atom have? How many neutrons does platinum have… Hence, number of neutrons is 39 - 19 which is 20. So for potassium, 19 taken away from 39 leaves 20 neutrons. 41 = 19 + # neutrons. Potassium-39 has twenty neutrons. How many neutrons does mercury have? Figure 2.1.2: How many neutrons do (K) potassium-39 and potassium-40 have, respectively? Name: Potassium. # neutrons = 22. Blurtit. How many protons does mercury have? 1)An ion of potassium has a charge of +1. So to get the number of neutrons, you take the average mass of 39 and subtract the number of protons and that leaves you with 20 neutrons. Potassium Chloride (KCl) Potassium Fluoride (PF) Potassium Iodide (KI) Interesting facts: It was the first metal to be isolated using electrolysis. Switch to. Chemistry Q&A Library Please help questions! Your dashboard and recommendations. By subtracting the number of protons or electrons from that number (in this case, 19), the total remaining is the number of neutrons. How many protons and electrons does this ion have? Hence, number of neutrons is 40 - … 78. Symbol: K. Atomic Number: 19. Potassium-40- It has 19 protons and atomic mass is 40. 3.7 million tough questions answered. Potassium-40 has twenty one neutrons. Since potassium has 19 electrons you know that it then has 19 protons because there is no charge change. It is found in all living plant and animal cells. We know that potassium has an atomic number of 19 and an atomic mass of 39.0983 amu. How many protons does helium have? It burns with a violet flame. Atomic Mass: 39.0983 amu. Potassium is element #19, that means K has 19 protons. People rarely look at the world around them in atomic terms, unless perhaps they are scientists. 2. 80. Mass number = # protons + # neutrons. How many neutrons does hydrogen have? Booster Classes. Study Guides. Other examples of isotopes: C-12, C is #6, it … How many protons does platinum have? 117. Get the detailed answer: How many neutrons do (K) potassium 39 and potassium 40 have, respectively? And how did I know? Home. By plugging in these values, we can therefore deduce that:Atomic Number (19) = 19 ProtonsAtomic Number (39.0983) = 19 Protons + Number of NeutronsNumber of Neutrons = 39.0983 - 19 = 20.0983 ≈ 20 In essence, potassium has 20 neutrons. Rounded down, it is 39 for potassium. 0. Personalized courses, with or without credits. 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