Potassium -40half life = 1.28 ×10∧9.
Radioisotope can be used to determine the age of fossils, to treat skin disease, to sterilize foodstuffs, and also to sterilize surgical instruments.
Radioisotope dating is a way to estimate a fossil's age by a method of analyzing the elemental isotopes which are within the rocks which it is in.
Hello,
The answer is "28 neutrons".
Reason:
The element Chromium has:
Protons:24
Neutrons:28
Electrons:24
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit
<h2>Hello!</h2>
The answer is: 
<h2>Why?</h2>
First, we need to look for the K molecular mass:
Also, we need to remember that 1 mol of a compound or element is equal to 
of that compound.
From the statement, we are asked to calculate how many atoms of K are present in 195,49 of K.
So, doing the calculations, we have:
So, we have atoms of K in 195,49 grams of K.
Have a nice day!
A real gas behaves closely to ideal behavior at low pressures and high temperatures.<span>As the temperature is increased, the behavior of the gas appears to become more ideal. </span><span>From the above figures, it can be deduced that a real gas behaves closely to ideal behavior at low pressures and high temperatures.</span>
Answer:
The water in the stream is acidic since the pH of the water is 6.4, and numbers under 7.0 on the pH scale is considered acidic. And because it is more acidic, it obviously has more hydronium ions than hydroxide ions. But if we wanted to make sure, [H3O+] = 10^-6.4 which equals a 3.98 x 10^-7 molar concentration of hydronium while [OH-] = 10^-7.6 which equals 2.51 x 10^ -8 molar concentration of hydroxide. And since 3.98 x 10^-7 is greater than 2.51 x 10^-8, there are more hydronium ions than hydroxide ions.
