An element has an atomic number of 26. It has 40 neutrons and 26 electrons. Calculate its atomic mass.

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.