How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors?

they have one or two valence electrons, so they cannot lose electrons easily.

they have one or two valence electrons, so they can lose or gain electrons.

they have three to six valence electrons, so they cannot lose electrons easily.

they have three to six valence electrons, so they can lose or gain electrons

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.