complete the table
elemets or ion atomic number mass number proton neutrons electrons
Ba+2
Ru+3
Cr+2
S-2
Ba+2 - atomic number: 56, mass: 137 a.u., protons: 56, neutrons: 81, electrons: 54.
Ru+3 - atomic number: 44, mass: 101 a.u., protons: 44, neutrons: 57, electrons: 41.
Cr+2 -atomic number: 24, mass: 52 a.u., protons: 24, neutrons: 28, electrons: 22.
S-2 - atomic number: 16, mass: 32 a.u., protons: 16, neutrons: 48, electrons: 18.
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