0
K always has 19 protons, because that is what defines it as an element.
40, the Atomic Mass is the sum of protons and neutrons. So if you subtract the number of protons from the atomic mass, you get the number of neutrons.
40-19=21 neutrons
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What substance is changed to a new substance?
Any substance can be changed to a new one.Answ2. The above is wrong. Lead for example cannot be changed into nitrogen.If some of the nucleus of an atom can have a proton or neutron, added or subtracted, then an isotope can be created, though generally an isotope of the same element.Consider the decay of K40 into Ar40. This is a change of one substance into another.
What are the impurities in the zirconium silicate?
These impurities are produced during the production process. They are mainly grouped into 4 categories. 1. Detrimental impurities like Fe2O3、TiO2 and Al2O3. 2. Basic harmless impurities like SiO2 and HfO2. 3. Trace alkali impurities like Na2O、K2O and P2O5. 4. Radioactive contaminants like Ra226, Th232 and K40.
Is technetium a synthetic element used in smoke detectors?
Americium is the radioactive element used in ionization type smoke detectors. It is a by-product of the nuclear power industry. In the device, it is present as the oxide, which is rather chemically inert and has a high melting point. As a small capsule enclosed in metal foil. Your exposure to radiation from an ionization smoke detector is smaller than your exposure received by sleeping alongside your partner who is converting K40 into Ar40.
What are the atomic numbers of first 20 elements?
Atomic Mass of the mainly occurring isotopes) of the first 20 elements (rounded figures)Ordering on atomic number 1 - 201 H4 He7 Li9 Be11 B12 C14 N16 O19 F20 Ne23 Na24 Mg27 Al28 Si31 P32 S35.5 Cl36 Ar39 K40 Ca*) But actually there are about 85 'different mass' isotopes from these 20 elements.K on its own already has 4 different isotopes with mass numbers, ranging from 39 to 42Ca on its own already has 9 different isotopes with mass numbers, ranging from 40 to 48
Where is k40 on Mercedes w210?
under the hood on drivers side. take off cover to fuse box and the area closest to the passenger side has a cover with I believe four screws. the K40 relay is in there.
Is the k40 CB antenna a marine band antenna and if not will it work with a marine band raido?
The K40 will not work as a marine band antenna, as it is "cut" (optimised) for 26-30Mhz. The Marine Band of frequencies is usually found 156-174Mhz.
What is polypropylene k40?
K means calcium carbonate filler and the 40 means 40% calcium carbonate.
Which is more abundant K39 K40 OR K41?
K-39 is the most abundant, constituting about 93 % of the atoms in naturally occurring potassium.
The half life of K is 1.28109?
The closest match in my (rather old) reference is K40, with a half life of 1.248x109 years. But precision was lacking in the question.
What computers are on the passengers side engine compartment in the Mercedes Benz 1998 C230?
me = engine module the esp = traction module and the k40 relay fuse box is in there
Your Mercedes slk 230 keeps cutting out and stalling?
Inspect k40 relay board and replace it if the soldered joints at top right of board are defective or resolder them. Please see: Link
What keeps the rocks inside the earth in molten state?
Radioactive decay in the inner core of k40 U238 and Th232 cause the earths internal heat plus lithostatic pressure (pressure of the overlying rocks).
Where is the fuel pump relay on a 1996 Mercedes e320?
In the engine compartment in the control module box. This is the little area by the right hood hinge that contains the control module. It is the K40/4 relay. Hope this helps.
Why do you use potassium in determining the age of the ancient rock?
Some of Potassium-40 decays into Argon-40 at a half - life of 1.25 x10^9 years. [About 11% of K40 decays by this method, the other 89% decays into Ca40 which is stable. ] The Argon-40 remains trapped in the crystal matrix, and may with care be recovered. So it is just a matter of determining in the laboratory the proportions of each of the materials, and applying the half-life calculations. [A 70kg person has around 4000 K40 nuclei decaying each second!]
What people do about nuclear radition?
Not all nuclear radiation is very harmful. (But it is still better to minimise your exposure to it.)Bananas for example contain potassium, and so do you.Potassium40 has a half life of 1.3x10^9 years before it becomes Argon40 or Calcium40. (different reactions)And you contain K40, and it likewise decays as above. K40 is about 0.012% of the total potassium.Granite gives off a dangerous radioactive heavy gas called Radon, and this is a problem with granite houses, and sometimes with basements.The best thing to do about radiation is to become well informed.
Chromium-48 has a half-life of 21.6 h How long will it take 360.00g of chromium-48 to decay to 11.25g?
Potassium has many isotopes, but the half life of K40 is listed as 1.28x109 years. This is a much used radioisotope. Bananas which are rich in potassium have been known to set off radiation alarms at the shipping port, because of the K40 - Ar40 decay. And another potassium trivia; you'll accumulate about as much radiation by sleeping alongside your partner (who has K40 decay proceeding) as you will get from the ionization type smoke detector.
