IUPAC

CHEMISTRY IS LIFE
twenty element and oxidation number

1=H=±1--->it exist as both metal and non-metal
2=He=0
3=Li=+1
4=Be=+2
5=B=+3
6=C=-4---->its -4 cause it already has 4 electrons..,let's take this for example, u have $215 and you want a phone of $430, you have to look for the other half cause its almost complete,also with carbon,it has to pair to be filled
7=N=-3
8=O=-2
9=F=-1
10=Ne=0
11=Na=+1
12=Mg=+2
13=Al=+3
14=Si=±4--->It's +4 cause Silicon is a metal
15=P=-3
16=S=-2
17=Cl=-1
18=Ar=0
19=K=+1
20=Ca=+2

We all know water=H2O
now for the proof
H=+1
O=-2
Crossmultiply = Hydrogen take the (2), while Oxygen(1)
Rewrite=H2O

Iron (iii) oxide
iron=+2 or +3
our question says iron (iii), so its Fe+3, O=-2
Fe=+3
O=-2
Cross multiply=(Fe)2(O)3
No difficult right?
Now you try them...

chemist has all the SOLUTION

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TOP4 CF
1=>
The football-shaped carbon cluster C has been called ‘the most beautiful molecule’, and if you have an eye for symmetry it’s easy to understand why. But if you ever liked chemistry in school, or actually have a career working in chemistry, you know chemistry goes beyond ‘beauty’.
Like physics, there’s an inherent romance to chemistry that stems from ‘truth’, rather than classic aesthetic features. Hopefully, these quick chemistry facts and tidbits will spark or re-new interest in this most noble science.
2=>
Lightning strikes produce Ozone, hence the characteristic smell after lightning storms
Ozone, the triple oxygen molecule that acts like a protective stratospheric blanket against ultraviolet rays, is created in nature by lightning. When it strikes, the lightning cracks oxygen molecules in the atmosphere into radicals which reform into ozone. The smell of ozone is very sharp, often described as similar to that of chlorine. This is why you get that “clean” smell sensation after a thunderstorm.
3=>
The only two non-silvery metals are gold and copper
A metal is an element that readily forms positive ions (cations) and has metallic bonds. These elements have electrons that are loosely held to the atoms, and will readily transfer them. This is why metals are great electrical and thermal conductors — because the electrons move energy.
Most metals’ electrons reflect colors equally, so the sun’s light is reflect as white. Gold and copper, however, happen to absorb blue and violet light, leaving yellow light. It’s worth noting here that copper is also the only metal that is naturally antibacterial.
4=>
Water expands when freezes, unlike other substances
Typically, when something is cold, it shrinks. That’s because temperature describes atomic vibration — the more vibration, the more space it takes, hence expansion. Water is an exception. Even though it vibrates less when it’s frozen, the ice occupies more volume.
That all fb could take..CHEMISTRY IS LIFE...