Which is a component of John Dalton's atomic theory?

The ratio of atoms in a compound can vary.

The atoms of a single element differ.

An atom is a small particle that cannot be broken down.

Atoms of different elements can be identical.

Energy produced by nuclear fusion and fission

How many protons and neutrons in the atom K-42

Three elements have the electron configurations 1s2 2s2 2p6 3s2 3p6, 1s2 2s2 2p6 3s2, and 1s2 2s2 2p6 3s2 3p6 4s1. The first ionization energies of the three elements (not in the same order) are 0.4189, 0.7377, and 1.505 MJ/mol.

As the population increases, so does household waste. The most environmentally friendly, and also realistic, solution to this state's household waste problem would be A) more extensive use of landfills. B) building underground waste storage tanks.

Is the process of bananas ripening a chemical change or a physical change?

Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?

A sample of gas occupies 40.0 mL at - 123°C. What volume does the sample occupy at 27°C if the pressure is held constant? V1T2 = V2T1 Don't forget to convert temperature to kelvin! Group of answer choices 8.80 mL 20.0 mL 80. ML 182 mL