Author Question: An acetylene molecule contains 2 atoms of carbon. The number 2 represents how many significant ... (Read 50 times)

cookcarl · **on:** Aug 27, 2018

An acetylene molecule contains 2 atoms of carbon. The number 2 represents how many significant figures?

A) one
B) two
C) three
D) infinite

Question 2

Which are isotopes? An atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has

A) an atomic number of 21 and a mass number of 42.
B) an atomic number of 20 and a mass number of 40.
C) 22 neutrons and 20 protons.
D) 22 protons and 20 neutrons.