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