35 POINTS An atom of an element has 54 protons. Some of the element’s atoms have 77 neutrons.

Others have 79 neutrons.

What is the mass number for the atom that has 77 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does this element have?
What is its atomic number?
What is the mass number for the atom that has 79 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does it have?
What is its atomic number?

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.

Idon’t really understand the question i’m sorry i can’t