U-238 has 92 protons, 146 neutrons, and 92 electrons.
Rn-222 has 86 protons, 136 neutrons, and 86 electrons.
U-238 is Uranium 238 and Rn-222 is Radon 222.
Answer: Iron loses three electrons and oxygen gain two electrons.
Explanation:
- this reaction represents the formation of rust of Fe.
4Fe + 3O2 → 2Fe2O3
- The Fe is oxidized by oxygen and converts from Fe (oxidation number = 0) to Fe3+ (oxidation number = 3+) that Fe loses 3 electrons.
- The oxygen is reduced and the oxidation state changed from 0 to 2- that oxygen loses 2 electrons.
- The other 2 choices are clear to be wrong.
₈₄²¹⁰Po ⟶ ₈₂²⁰⁶Pb +
Your equation is:
₈₄²¹⁰Po ⟶ ₈₂²⁰⁶Pb + ?
It becomes easier to balance the equation if we replace the "?" with an element symbol _<em>x</em>^<em>y</em>Z.
Then the equation becomes
₈₄²¹⁰Po ⟶ ₈₂²⁰⁶Pb +_<em>x</em>^<em>y</em>Z
The main point to remember in balancing nuclear equations is that the <em>sums of the superscripts and the subscripts</em> must be the same <em>on each side of the equation</em>.
Sum of superscripts: 210 = 206 + <em>y</em>, so <em>y</em> =4.
Sum of subscripts: 84 = 82 + <em>x</em>, so<em> x</em> = 2.
₈₄²¹⁰Po ⟶ ₈₂²⁰⁶Pb +
We should recall that is an <em>α particl</em>e.
Thus, the equation represents the α decay of polonium-210 to lead-206.
The nuclear equation is
₈₄²¹⁰Po ⟶ ₈₂²⁰⁶Pb +