I’d argue that Li should be red and Hg should be yellow.
Elemental mercury in liquid form is fairly safe. It needs to get into your blood in order to be a problem, and even if some does stick to your tongue and get swallowed the digestive absorption is extremely low.
Your laptop uses an iGPU. The “i” stands for integrated, as it’s built into the same package as the CPU.
The alternative, a dGPU, is a discrete part, separate from other components.
They’re saying that your situation is becoming increasingly common. People can do the gaming they want to without a dGPU more easily as time goes by.