An element of helium consists of 2 protons, 2 neutrons, and 2 electrons. I have been told that anti-helium can exist if instead of 2 protons there are 2 antiprotons, instead of 2 neutrons there are 2 antineutrons, and instead of the 2 electrons there are 2 positrons. Is this true? Also, will the "anti-helium" exhibit different properties? Can we apply all of our laws of atomic physics to anti-matter as we do with normal matter? Thanks.