sentences: the nucleus of an atom is usually made of both protons and neutrons & the melting is the peripheral of an eve ->  the core of an atom is made of protons and neutrons  electrons surround the nucleus of an atom & the melting is the peripheral of an eve -> electrons surround the core of an atom electrons surround the core of an atom  the peripheral of an eve is made of looking and following & electrons surround the core of an atom -> an atom is made of a core of protons and neutrons surrounded by electrons