The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side span a distance of 4.56 mm?
atoms

The flowers in a flower arrangement are actually alive

Where is the graph ?

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).