Why does the atomic radius of elements get bigger as we go from top to bottom on the periodic table?

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

The boiling point of liquids is very high what does it indicate

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.