[Misseev]

Hey Everyone!
I was given a hand out on atomic structure which is fairly straight forward to me for the most part however I am getting hung up on the one question and wondered if anyone might be able to help? We were asked to fill out a table with the atomic symbol, atomic number, mass number, number of protons, number of neutrons and number of electrons assuming that the atoms have no net charge.
The table looks like this:

Symbol: Kr ? ? Dy
Atomic #: 36 ? ? ?
Mass #: ? ? 235 ?
# Protons: ? 25 ? ?
# Neutrons: ? 27 ? 98
# Electrons ? ? 92 ?

We are supposed to fill in the blanks wherever the question marks appear.
I am getting a little hung up on some of the numbers, I feel like some of them might be a bit off? For instance the second column- the element with 25 protons would therefore have to have an atomic number of 25,making it manganese
To find the number of neutrons you subtract the atomic number from the atomic mass which for manganese would be 54.9-25, which gives you 34.9, however the column lists the number of neutrons as "27" I ran into this problem a couple times and wondered if anyone had any suggestions?    I really appreciate it thank you so much

[Corribus]

Have you considered why the mass number that you looked up has a decimal in it? This is because the mass number varies for different isotopes for the same element, and the value reported in most periodic table reflects a weighted average (the weighting being the natural abundance).  In other words, element Dy can only have one value for the atomic number, but many different values of mass # may be acceptable depending on what isotope is being considered. I would suggest, when filling out this table, that you do not look up the mass # on the period table: fill this row out based on other information that is unique to each element, such as proton #, electron #, and atomic #.