Question

an atom of an element has 11 protons 11 electrons and 12 neutrons . The atomic mass of the atom is ​

Answer 1

Answer:

mass of atom is is the sum of protons and neutrons

number of neutrons= 12

number of protons= 11

11+12=23 amu

Explanation:

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Answer 2

Explanation:

11 protons the element is Na

so, the atomic mass is

we should double the atomic number

now, 11*2= 22 or 22.99