Study Guides. How many neutrons does platinum have… How many protons does helium have? Switch to. Name: Potassium. 0. Blurtit. It catches fire when exposed to water. How many neutrons does potassium have? Booster Classes. 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. Other examples of isotopes: C-12, C is #6, it … How many protons does platinum have? So for potassium, 19 taken away from 39 leaves 20 neutrons. Mass number = # protons + # neutrons. 3.7 million tough questions answered. Homework Help. We know that potassium has an atomic number of 19 and an atomic mass of 39.0983 amu. ----protons -----neutrons --- … Atomic Mass: 39.0983 amu. Rounded down, it is 39 for potassium. 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. How many neutrons does mercury have? Potassium is element #19, that means K has 19 protons. Home. 117. Number of Neutrons: 20. Symbol: K. Atomic Number: 19. And how did I know? 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. Hence the number of neutrons is the atomic mass minus the atomic number, 39 - … Clearly, there are 19. Get the detailed answer: How many neutrons do (K) potassium 39 and potassium 40 have, respectively? Chemistry Q&A Library Please help questions! How many protons does mercury have? 78. 41 = 19 + # neutrons. Your dashboard and recommendations. How many protons and electrons does this ion have? Potassium-40 has twenty one neutrons. ----protons __-_electrons -----neutrons 2)An ion of oxygen has a charge of -2. how many protons, neutrons, and electrons does the atom have? By subtracting the number of protons or electrons from that number (in this case, 19), the total remaining is the number of neutrons. The element in question is potassium, the 19 symbolising the atomic number, the number of protons. Hence, number of neutrons is 40 - … 2. 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. Potassium-39 has twenty neutrons. Since potassium has 19 electrons you know that it then has 19 protons because there is no charge change. Basic Information. 80. How many neutrons does hydrogen have? # neutrons = 22. Hence, number of neutrons is 39 - 19 which is 20. It is found in all living plant and animal cells. 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