Why aren't iron, cobalt and iron in the same group of elements?

What is an isolated system

A solar day is the time it takes Earth to rotate on its axis between two consecutive solar positions (for example, high noon to high noon or sunset to sunset).

A student performs an experiment to determine the density of a sugar solution. They obtain the following results: 1.71 g/mL, 1.73 g/mL, 1.66 g/mL, 1.68 g/mL. If the actual value for the density of the sugar solution is.

Two cars have the same weight, but one of the cars has an engine that provides twice the power of the other. which car can make it to the top of a mountain pass first? which car does more work to reach the pass

An object with a mass of 2 kg has a force of 4 N acting on it. What is the acceleration of the object?

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars

A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?

A car is driving towards a brick wall at a constant velocity (don't try this at home!) and the driver honks the horn of the car. the sound of the horn reflects from the wall and the echo is heard by the driver.

Mass number of an atom with 11 protons

Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium