The number of protons + neutrons A = 4. If the number of neutrons N is 2 then there must be 4 - 2 = 2 protons. There are 2 protons in the helium nucleus. A helium atom has two electrons in an energy ...

If you've learned all the elements from actinium to zirconium, it's time to head back to the periodic table, where there's a new, extremely heavy element in town. In case you forgot your high school ...

"With evidence that quarks and gluons are entangled, this picture has changed. We have a much more complicated, dynamic system." When you purchase through links on our site, we may earn an affiliate ...