- Think Critically Oxygen-16 and oxygen- 17 are isotopes of oxygen. The numbers 16
and 17 represent their mass numbers,
respectively. If the element oxygen has an
atomic number of 8, how many protons
and neutrons are in these two isotopes?

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Which of the following would be a correct step in proving that triangle abc is congruent to triangle cda? a. use a protractor to measure the angles and show that all the corresponding angles are equal in measure. this will allow you to prove congruence by aaa. b. show that segment ab is parallel to segment cd and segment ad is parallel to segment cb. this will allow you to prove congruency by asa. c. show that is segment ab is perpendicular to segment ad. this will allow you to prove congruence by sas. d. none of the above.