Consider the three isotopes of carbon. What do the three isotopes have in common? Choose all that apply. A)
They have the same atomic number.
B)
They have the same number of protons.
c)
They all have four valence electrons.
D)
They have the same number of neutrons.
E)
They have the same average atomic mass number,

4241242152125521

Step-by-step explanation:

64332241242

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !