Atoms in the same period have the same number of energy levels, which also helps scientists predict how an atom will interact with other atoms. In Dimitri Mendeleev's periodic table, elements in the same vertical group have _____.
NonVisual Desktop Access (NVDA) is a free, open source, portable screen reader for Microsoft Windows. The project was started by Michael Curran in 2006. NVDA is programmed in Python. It currently works exclusively with accessibility APIs such as Microsoft Active Accessibility, IAccessible2 and the Java Access Bridge, rather than using specialized video drivers to intercept and interpret visual information. It is licensed under the GNU General Public License.
1 While NVDA has early support for accessing Windows and many Windows applications, we will be focusing on accessing web content only. 2  Make sure that NumLock is off. 3  You will probably want to test NVDA in Mozilla Firefox, even if it is not your primary browser.