Please someone help with Lab: Physical and Chemical Changes.

Ibelieve the answer is d. titaniumhope my answer has you : )

The answer is just took the test

Is there a c and d?

Most elements have more than one naturally occurring isotope. as you learned previously, the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same element, but they have different mass numbers (total number of protons and neutrons) giving them different atomic masses. so which mass is put on the periodic table for each element? is it the most common isotope’s mass? the heaviest mass? this activity will answer that question.