What is Yttrium Mass Number, Atomic Number, Protons, Neutrons, Electrons ?

Explanation:

Atomic Mass                 88.90585 atomic mass units

Number of Protons39

Number of Neutrons50

Number of Electrons39

   The three parts of a paragraph are the topic sentence, supporting details, and a conclusion. The beginning of a paragraph it the topic, this is the part where you put a topic sentence so that you can introduce your topic to the reader. The next part of a paragraph is the supporting details, this is where you put evidence to support your reasoning so that you can make it clear on what your topic is. The last part of a paragraph is the conclusion, this is where you wrap up the closing statement, restating some of your evidence and your topic again. The topic sentence, supporting details, and a conclusion are the three attributes of a paragraph.