Abantu bize ubutabire bazi ‘element’ yitwa Helium (He) ni iya kabiri muzigize table periodique des elements. Helium ni iya kabiri nyuma ya Hydrogene, ikaba irangwa n’umubare wa 2, ikaba isanzwe ibarirwa mu myuka (gas). Abahanga mu butabire bavuga ko ari gas ituje, itajya inyeganyega iyo ihujwe n’ibindi binyabutabire. Nubwo ari uko byari bisanzwe bimeze uko, […]Irambuye