What is the element whose symbol is K?, calcium, potassium, Which pair of sub-atomic particles has similar mass?, protons and neutrons, electrons and protons, Which element, its atomic number equals its mass number?, Hydrogen, nitrogen, Energy level (L) has lower energy than level (K)?, true, false, Which of the following is an inactive element?, N (nitrogen), Ne (neon), Which element is responsible for developing strong roots?, potassium, phosphorus

1st prep, atomic structure

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