Which is a way that the elements are grouped on the periodic table? (2 points)
elements in the same row have the same number of protons.
elements with similar bonding properties are in the same column.
elements in the same column have the same number of neutrons.
elements with similar mass are placed in the same column.

In an energy pyramid, which level has the most available energy?

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)