1 Select Advanced from the left menu of the Editor options dialog. 2  Scroll down to Display email contents section (near the bottom). 3  Uncheck the box to Show picture placeholders. 4  Then click OK to apply and close the dialog.n Outlook 2010 you need to follow these steps to enable images to be seen in emails. When the Options window opens, select Trust Center from the left side of the window. From the right side of the page, click the Trust Center Setting... button. From the left side of the page, select Automatic Download.
The electron was first discovered in 1898 by Sir John Joseph Thomson. Almost 100 years ago J.J. Thomson was at Cavendish Laboratory at Cambridge University. Thomson was investigating 'Cathode Rays' which had been a puzzle for a long time.
An atom consists of a central nucleus surrounded by an electron cloud. The nucleus is a tightly packed ball made up of protons and neutrons. The mass of the proton and the neutron are nearly the same. The mass of the electron is about 1/2000 of that. The proton has a charge of +1. The neutron has a charge of 0. The electron has a charge of -1. The number of protons in the nucleus is called the atomic number. It tells us what the element is. Hydrogen has one proton, helium has two, lithium three, etc. The number of neutrons gives you the isotope of the given element.