80. Clearly, there are 19. The element in question is potassium, the 19 symbolising the atomic number, the number of protons. How many neutrons does mercury have? Since potassium has 19 electrons you know that it then has 19 protons because there is no charge change. And how did I know? Mass number = # protons + # neutrons. Hence the number of neutrons is the atomic mass minus the atomic number, 39 - … Potassium is element #19, that means K has 19 protons. Get the detailed answer: How many neutrons do (K) potassium 39 and potassium 40 have, respectively? Hence, number of neutrons is 39 - 19 which is 20. Potassium-40- It has 19 protons and atomic mass is 40. Booster Classes. Rounded down, it is 39 for potassium. How many protons and electrons does this ion have? 121. Because potassium has 3 isotopes, then we have to calculate for the different atomic weights of the isotopes: Potassium-39- It has 19 protons and atomic mass is 39. 3.7 million tough questions answered. # neutrons = 22. How many protons does platinum have? Home. Potassium-40 has twenty one neutrons. Potassium-39 has twenty neutrons. Other examples of isotopes: C-12, C is #6, it … ----protons -----neutrons --- … 2. 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. 78. How many neutrons does potassium have? ----protons __-_electrons -----neutrons 2)An ion of oxygen has a charge of -2. how many protons, neutrons, and electrons does the atom have? Chemistry Q&A Library Please help questions! Well, how many protons are in the [math]^{40}K[/math] isotope? How many protons does mercury have? Basic Information. It burns with a violet flame. 0. Number of Neutrons: 20. So for potassium, 19 taken away from 39 leaves 20 neutrons. By subtracting the number of protons or electrons from that number (in this case, 19), the total remaining is the number of neutrons. 41 = 19 + # neutrons. Switch to. How many neutrons does platinum have… Homework Help. 117. It catches fire when exposed to water. Blurtit. 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. How many protons does helium have? Figure 2.1.2: How many neutrons do (K) potassium-39 and potassium-40 have, respectively? Personalized courses, with or without credits. Atomic Mass: 39.0983 amu. Symbol: K. Atomic Number: 19. Your dashboard and recommendations. 1)An ion of potassium has a charge of +1. Hence, number of neutrons is 40 - … 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. Name: Potassium. Potassium Chloride (KCl) Potassium Fluoride (PF) Potassium Iodide (KI) Interesting facts: It was the first metal to be isolated using electrolysis. 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