Microsoft Online is free to use. It includes Microsoft Excel, Word, One - Note and PowerPoint. Microsoft Outlook (email app) is free as well, although it is a seperate download.
Another way to go is via Google docs, The Google drive is rather large and safe to store reports, docs, images, etc.
Both Microsoft online and Google Docs are accessible to use on virtually any device as in: PCs, Laptops, Tablets, Androids and Iphones.
Your mail gets sent across the internet to the other person you mailed to.
The number system is what is use globally as are way of counting the total number of digits is 9 because you can make any number with characters 1-9
Answer: This element needs 3 electrons to complete its octet state
Why?:
since the electrons in 2s2 are already paired they cannot form a bond pair with electrons from other elements without hybridisation however the 3 electrons in 2p3 are unpaired so can form bond pairs with electrons from other elements without hybridisation.
Hope this helps!