Elements of groups iiia and via of the periodic table tend to form ions with the respective charges of and
a. +3, -6.
b. +3, +6.
c. -3, +2.
d. +3, -2.

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

Explain what will happen if decomposers were apsent from a forest ecoysystem.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge