Every element on the periodic table is unique

[Chocolatemilkshake]

SULFUR: Sulfur is known for its bright yellow colour it exhibits in its pure crystalline form at room temperature. Sulfur makes up 3% of the earth’s mass, equal to the mass of 2 moons! It is a key element of two amino acids including methionine and cysteine.

While Sulfur is odourless in pure form, its compounds often smell quite bad. For instance, skunks and rotten eggs both release Sulfur compounds (Mercaptans and Hydrogen sulfide respectively) giving them that nasty smell.

[AngelWings]

Chlorine: The 21st most abundant element and 2nd most abundant halogen in the world, chlorine is involved in many salts, such as sodium chloride (table salt), and, as part of a compound, has many household uses e.g. to clean swimming pools and in bleach, as it prevents bacterial growth. In its purest form, it is usually seen as a gas form at room temperature with a yellow-green-ish colour (which is partially how it was named), but some free chlorine can be found in minute amounts in volcanic gases.

[RuiAce]

Argon: Cheapest noble gas to acquire when needed. It's relatively easy to produce, but it's also the third most abundant gas in the atmosphere. It's a useful alternative to nitrogen for extinguishers, and also in general whenever nitrogen is suspected to be too reactive.

It is the first noble gas that can form stable compounds. However they're usually only possible in very extreme conditions (e.g. HArF requires temperatures below 17 K).

Considering it's a noble gas, it's interesting how it should be present even in Earth's crust. (It occurs as one of its isotopes is a decay product from a potassium isotope.)

[sweetiepi]

Potassium: When burned, it emits a lilac coloured flame

English name (potassium) comes from the word potash. K (the symbol) is derived from the Latin- Kalium and Arabic qali.

[caffinatedloz]

Calcium: Pure calcium metal is highly reactive. When combined with water or acid it reacts vigorously and violently.

[Pearlmilktea]

Scandium -  used in aluminium-scandium alloys for aerospace industry components and for sports equipment such as bicycle frames, fishing rods, golf iron shafts and baseball bats. It is very $

Let's pretend I thought of that myself, even though I didn't take Chem for the HSC  To be fair I did remember what the next element was just not what the heckas it does (thanks ASAPScience).

[RuiAce]

Calcium: Pure calcium metal is highly reactive. When combined with water or acid it reacts vigorously and violently.

Yeah but so does sodium, potassium, rubidium, strontium, caesium and barium. Doesn't feel unique.

Calcium: One of, if not the most important components of bone. Almost 99% of the calcium in the human body is found in bone. It's also the most abundant metal element found in the human body.
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Titanium: Secretly, titanium-gold alloys are marketed as 24 karat gold. The titanium concentration is only 1%, but the resulting metal formed is more durable than 100% gold.

It's the first metal on the periodic table to be really far on the lower end of electrical conductivity.

Interestingly, it is present in roughly 97%-98% of all the identified types of igneous rocks.

It is the first metal to predominantly exhibit an oxidation state of +4.

[sweetiepi]

Vanadium: Was discovered twice, once in 1801, and once in 1830.
It was also used in WW1 to make mobile artillery pieces and body armour!

[RuiAce]

Chromium: The main additive that gives stainless steel its corrosive-resistance property.

It is the lightest metal such that +6 is one of its common oxidation states. (Cr(VI) is know to be a carcinogen.)

Its Cr(III) ion is what gives rubies their red colour.

[sweetiepi]

Manganese:
Foods that are rich in this element include- spinach, nuts, and oysters!
The purple colour of amethyst is caused by managanese!

[Chocolatemilkshake]

IRON: Iron is thought to be the most abundant of all metals on earth, as the earth's core is believed to be heavily composed of iron. In pure form, iron will quickly corrode on exposure to air. For this reason, it is most often alloyed with carbon to make steel, which is more resistant to corrosion (in fact, iron is the most commonly refined metal!)

Iron is also essential for human survival. 70% of iron in the human body is present within haemoglobin. This iron enables oxygen to be effectively transported around the body. For this reason, iron deficiency can leave you tired and short of breath (as your body can not longer deliver oxygen as efficiently to all parts of the body).