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.
The color standard used was called NTSC and is the standard definition color encoding system that is still used today, more than half a century on. Color television made its debut in the US in the early 1950s. It was a commercial failure and was withdrawn after only a few months. By 1955 a national standard for color television was agreed and RCA launched color services.