adryannabayjay adryannabayjay

14-02-2018
Physics

contestada

An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element

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kellykelllll kellykelllll

18-02-2018

beryllium: mass number of an atom = number of neutron + number of proton in the nucleus = 5+4=9

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