Number one, it's probably a really easy question but it confused me

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false