Multiple Choice
An unknown element is found to have three naturally occurring isotopes with atomic masses of 
and 
Which of the following is the unknown element?
A) Ar
B) K
C) Cl
D) Ca
E) None of the above could be the unknown element.
Correct Answer:
Verified
Correct Answer:
Verified
Q17: Which species below is the chromate ion?<br>A)Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup><br>B)CrO<sub>4</sub><sup>2-</sup><br>C)CH<sub>3</sub>COO<sup>-</sup><br>D)CO<sub>3</sub><sup>2-</sup><br>E)None
Q18: In the symbol below,x is _. <img
Q19: Which formula/name pair is incorrect?<br>A)FeSO<sub>4</sub> iron(II)sulfate<br>B)Fe<sub>2</sub>(SO<sub>3</sub>)<sub>3</sub> iron(III)sulfite<br>C)FeS
Q20: The correct name for HClO<sub>3 </sub>is _.<br>A)hydrochloric
Q21: When calcium reacts with sulfur the compound
Q23: Which combination of protons,neutrons,and electrons is correct
Q24: 87 pm is the same as _
Q25: Which pair of atoms constitutes a pair
Q26: Potassium forms an ion with a charge
Q27: Which one of the following polyatomic ions