객관식Which of the following element symbols correctly represents an element with atomic number between 1 and 36?101views
객관식Which of the following is the symbol for the element located in group 4A (14) and period 2 of the periodic table?103views
객관식Which of the following lists contains only correct chemical symbols for three different elements?115views
객관식Which of the following is the correct chemical symbol for the element with atomic number 12 among the first 20 elements of the periodic table?104views