Why is helium placed in the p-block?
Why is helium a p-block element?
Is helium an element, mixture or a compound? What is helium 3? What is the main source of helium? How can you describe helium? How do helium-3 and helium-4 differ? Is Helium considered an inert gas? If not, why? What are main source of helium gas? Why does a Hydrogen atom not have a neutron? What would be the benefits if we discovered an element lighter than helium but it exists as a solid in room temperature? Any possible uses? Why neutrons are present in atom? How many protons electrons and neutrons are in a helium atom? Why is the effective radius of a helium atom less than the hydrogen atom? What element does not contain any neutrons? What are the consequences of getting high on helium? In nuclear reactor reactions, "4H -> He+ 2positrons and some gases... Then, what happens to helium in above reaction? When we run out of Helium, what will we use for balloons? What would happen if we run out of helium? What can you do to make helium non flammable? Why do the atoms of elemental gases repel each other while atoms of elemental solids do not? Assuming no leaks, why should a balloon remain inflated? Is hydrogen an element or an atom? What is a oxidation number, and what is this number for helium? Why is oxygen considered an element? What is reason for charge on particle? What does neutrons add to an atom? What will happen when we finally run out of helium? Why do MRI machines need helium? Which of the two gasses is more polar, CH4 or Helium? How are neutrons and protons different? What is a neutron? What is the role on a neutron in an atom?