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