Chemistry is the science of materials, their composition and structure and the changes they undergo, we study chemistry because

Which of the following statements is true about planck’s law

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

How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123