Why Do the Isotopes of the Same Element Have the Same

Q13: How many electrons are in the ion,Ni²⁺?<br>A)

Q14: Match the following.

Q15: The number 6.022 × 10²³ is called

Q16: What element is defined by the following

Q17: Give the name of the instrument that

Q19: Give the symbol for potassium.<br>A) K<br>B) P<br>C)

Q20: Give an example of an halogen.

Q21: How many moles of Cs are contained

Q22: What does "X" represent in the following

Q23: Rutherford proposed the<br>A) atomic bomb.<br>B) hydroelectric.<br>C) First