what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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which symbol correctly represents an element (d) whose atoms contain 15 protons and 20 neutrons?
the atomic mass is 15+20=35 while the atomic number is 15
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