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Chemistry 19 Online
OpenStudy (anonymous):

What is the mass number of Be with 5 neutrons?

OpenStudy (kira_yamato):

Be has 3 protons. Mass # = 8

OpenStudy (joannablackwelder):

Be has atomic number 4, meaning it has 4 protons. Mass number is protons + neutrons = 4+5=9.

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