Question

Study the table below and use it to answer the questions that follow. (The letters do not represent the actual symbols of the elements).

Element	S	P	Q	R	T
Atomic Number	5	20	3	18	5
Atomic mass	10	40	7	40	11

1. Select two letters that represent a pair of isotopes 
2. Give the number of neutrons in an atom of element T

Answer 1

• S and T  
• 11- 5 = 6