What is the similarity of primary and secondary cell​

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

Which of the following is not true about the atomic model of substances?

Once similarity and one difference between a mixture of elements and a mixture of compounds