Atoms of elements that are in the same group have the same number of a-protons b-neutrons c-valence electrons d-protons and neutrons

Is this a single replacement reaction or there is no

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

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.