Which of the following pairs are isotopes? A) Ca2+ and Mg2+ ...

[tnt_battle]

Which of the following pairs are isotopes?
 
  A) Ca2+ and Mg2+
  B) 199Hg and 200Hg
  C) 18O and 19F
  D) 238U and 238Np

Question 2

Fr+ is called ________.
 
  A) a cation
  B) an anion
  C) an isotope
  D) a non-metal

Question 3

Water consumption from all aquifers, on average, is less than the amount of water returned to the aquifer by natural processes. Why should we worry about water use?
 
  A) The average amount does not reflect that drier areas have a harder time refilling the aquifers.
  B) Because the water returned is contaminated.
  C) The average amount does not take into account the water consumed during photosynthesis to make carbohydrates.
  D) Water is nothing to worry about.
  E) none of the above

[irishcancer18]

Answer to Question 1

B

Answer to Question 2

A

Answer to Question 3

A

[tnt_battle]

Thanks for the timely response, appreciate it

[Dinolord]

Gracias!