Key Concepts. 1  The electrons on the outermost energy level of the atom are called valence electrons. 2  The valence electrons are involved in bonding one atom to another. 3  The attraction of each atomâs nucleus for the valence electrons of the other atom pulls the atoms together.
NTSC is the format used in the United States and Canada. NTSC stands for National Television Standard Committee which established the American TV broadcast TV standard as a 525 line broadcast. The NTSC system has higher frame rate (60 Hz) which reduces visible flicker and picture noise.
Television encoding systems by nation. Countries that are using the NTSC system are shown in green. NTSC-J is the discontinued analog television system and video display standard for the region of Japan that ceased operations in 44 of the country's 47 prefectures on July 24, 2011. Analog broadcasting ended on March 31, 2012 in the three prefectures devastated by the 2011 Tohoku earthquake (Iwate, Miyagi, Fukushima).