An atom of element a has 89 protons. what would the element's atomic number be?

Different isotopes indicate that an element will have different numbers of

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

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.