Electrons that have the highest energy are valence electrons nuclear electrons part of the nucleus closest to the nucleus this is science

Electrons that have the highest energy are valence electrons. This is because the electron(s) on the outer shell are further away from the attractive force of the nucleus (remember, the nucleus is positively charged as protons are positive and neutrons are neutral, and electrons are negatively charged). This means that electrons on the outer shell are easier to remove, and are more reactive.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

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