Question

what makes isotopes of the same element different?
a number of neutrons
b number of bonds they form
c number of protons
d number of electrons
question 12 (1 point)
carbon - 14 has an atomic number of 6. how many neutrons does it contain?
a 14
b 12
c 8
d 6
question 13
if an atom of oxygen has 8 protons, 8 electrons, and 10 neutrons, which isotope is it?

Explanation:

Isotopes of an element have the same number of protons (defining the element), but different numbers of neutrons. For the number - of - neutrons calculation, the mass number of an isotope is the sum of protons and neutrons. For the oxygen isotope identification, we calculate the mass number from protons and neutrons.

1. Isotopes vary in neutron number.
2. For carbon - 14, mass number is 14 and atomic number (proton number) is 6. So neutrons = mass number - atomic number = 14 - 6=8.
3. For oxygen, with 8 protons and 10 neutrons, mass number = 8 + 10=18, so it is oxygen - 18.

Answer:

1. a. Number of neutrons
2. c. 8
3. b. Oxygen - 18