Which of the following best describes an atom a)protons and electrons grouped together in a random pattern b) protons and electrons group together an alternating pattern c) a core of protons and neutrons surrounded by electrons d) a core of electrons and neutrons surrounded by protons

The correct answer is option C, that is, a core of protons and neutrons surrounded by electrons.

An atom refers to the smallest component unit of usual matter, which exhibits the characteristics of a chemical element. Each of the liquid, solid, plasma, and gas comprises of ionized or neutral atoms. Each atom comprises of the nucleus and one or more electrons enclosing the nucleus. The nucleus comprises one or more protons and usually an identical number of neutrons.

d. the weight of the book