The distinction between an element and an isotope is A) an ...

[olgavictoria]

The distinction between an element and an isotope is
 
  A) an element has a specific number of both protons and neutrons; an isotope has a specific number of protons.
  B) an element has a specific number of neutrons; an isotope has a specific number of both protons and neutrons.
  C) an element has a specific number of protons; an isotope has a specific number of neutrons.
  D) these two words have the same meaning, but element is used by chemists while isotope is used by physicists.
  E) an element has a specific number of protons; an isotope has a specific number of both protons and neutrons.

Question 2

It is 39 trillion miles to the nearest star beyond the sun. Expressed in powers of ten, this is
 
  A) 3.9  1013. B) 3.9  109. C) 3.9  1010. D) 3.9  1012.

[xiazhe]

Answer to Question 1

E

Answer to Question 2

A

[olgavictoria]

TYSM

[jackie]

Excellent