Question

An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element? 4 5 8 9

Answer 1

Name: Beryllium

Atomic Mass: 9.012 atomic mass units

Number of Protons: 4

Number of Neutrons: 5

Number of Electrons: 4

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-Plushdna

Answer 2

The atomic mass is equal to the sum of the number of protons and neutrons. Then, it is
`p+n = 4+5=9`.

Hence, the answer is 9.