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Q13: Which isotope is not possible?<br>A) <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB7327/.jpg"
Q14: Oxygen,carbon,hydrogen,and nitrogen are called the building-block elements
Q15: An atom with A = 21 and
Q16: Strontium and barium have similar chemical properties.
Q18: The nucleus contains most of the mass
Q19: Which element is chemically similar to chlorine?<br>A)Sulfur<br>B)Calcium<br>C)Oxygen<br>D)Bromine<br>E)Argon
Q20: Which of the following properly represents the
Q21: Antimony is a metalloid containing 51 protons
Q22: Identify the element with the ground state