Calcium

(Chemi symbol Ca) A chemical element with atomic number of 20 and a molar mass of 40.08 grams.
In terms of physical properties, it's melting point is 1115°K or 842 °C (1548 °F) and boiling point is 1757 or 1484 °C (2703 °F). It's density is 1550 kg/m3 and it's molar volume is 26.20 cm3.
In terms of chemical properties: it is a group 2 metal (or Alkaline Earth Metal) with 2 electrons in the outermost valency shell. As well as 2, 8, and 8 electrons in it's 1st, 2nd and 3rd shell respectively, which are not used in chemical bonding.
Calcium ions typically have a charge of 2+ and exist in aqueous calcium salt solutions. Calcium exists, chemically bound, in human bones to provide strength as well as in Marble structures.
Calcium is not naturally found in its chemical form due to it's relatively high reactivity. However, it is the 5th most abundant element in the earth's crust. Elemental Calcium can be extracted through a process of smelting and electrolysis. It reacts spectacularly in water or when ignited in an oxygen rich atmosphere.
Calcium used for experimentation in labs is usually a dull greyish colour because the surface has been oxidised by atmospheric oxygen.
*Anyone who has bothered reading this far is truly a nerd (or someone doing an assignment)*

I am the science man who has concisely defined the chemical element calcium in his own words.

by Skyboy September 22, 2005

Callum

A truly madcore human being who prides himself on nothing more than waking up every morning and thinking, "Fuck, I'm, such a sick cunt".
Typically, this individual's mad skills are admired by his peers, who aspire to live in his shadow.

Guy#1: You seen that Callum?

Guy#2: Dude! Don't even say his name! We just call him 'God' around here.

Guy#1: Please dont tell him I said that.

by madcunnttt September 9, 2010

Callum T

iPad dribbling spastic

Callum T is an iPad Dribbling spastic

by dangleesack69 December 18, 2019

Callum

The ideal boyfriend for any girl. Excels at everything and is incredibly funny. Very handsome and just generally an amazing person.

I'm so lucky to be dating a callum

by Hotpotato05 April 7, 2020

Callums Corner

A middle aged man who has a tic tac for a head and cant take it when people point it out.

Callums corner is a reactor who has a tic tac head

by 1_up_ping on insta August 17, 2018

Callum

Callum is someone you can always rely on. He will help you through life, and make you a better person. He won't understand why everybody loves him. But you will all know it is because he is purly perfect. When you see him your heart will jump, when you hold him you will never want to let go. He is someone you want to call your own, he is also someone you would lay with for eternity. Callum is someone amazing, the best, and no one will ever compare to him.

Girl1- "Did you see that's Callum?"
Girl2- "Yeah, he's mine. I'm so lucky."
Girl1- "Oh wow really? I wish I had a Callum like him."

by mrsbrightside. June 13, 2013

Callum

Perfection

"he sure is a callum"

by burg~ September 28, 2014