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Q3: How many protons are there in an
Q13: Which of the following Period 4 elements
Q16: The maximum current would flow in a
Q21: In a battery circuit with different resistors
Q43: The percentage by mass of carbon in
Q47: When the equation Al + O<sub>2</sub>→ Al<sub>2</sub>O<sub>3</sub>
Q54: The Lewis symbol <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8644/.jpg" alt="The Lewis
Q57: Isotopes of an element differ in their
Q65: Which of the following polyatomic ions has
Q82: Give the chemical symbol for each element.