Why are the halogen elements so dangerous in their uncombined forms?

In bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus,

What happens to chemical bonds between atoms or ions during a chemical reaction?

What is a beneficial aspect of nuclear fission? A. The ability to absorb energy B. The ability to produce more energy than nuclear fusion C. The ability to release tremendous amounts of energy D. There are no beneficial aspects of nuclear fission

How is nuclear energy produced?

Organic hydrogenation reactions, in which H₂ and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C₂H₄) and H₂ form ethane (C₂H₆).

Which of the following is the correct scientific notation for 0.000451 g? 4.5 x 10-3 4.5 x 10-5 4.51 x 10-4 45.1 x 10-4

A phase change from a solid to a gas is called what

What is hydrocarbon?

Why did most scientists reject Wegner's theory for nearly a half century?

Define prediction and explain how it is used to formulate a hypothesis.