Why are group 2 or group 6 elements not used for doping semiconductors​

These group VI elements are not as good as the more ordinary dopants in germanium and silicon. They tend to form deep levels, traps, as well as shallow donor levels. The donor levels are less shallow than group V elements and so have limited usefulness at low temperatures (below 100 K).

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

the amount of current in the coil