What elements have configurations that end in ns2np2?

How many moles are in 15.0 grams of calcium? 0.374 moles 2.67 moles 601.5 moles 2.40 x 1025 moles

Which of the following could indicate that a chemical change has taken place? gas formation formation of a precipitate color change all of the above

Based on nuclear stability, what is the symbol for the most likely product nuclide when iodine-123 undergoes decay?

Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. C2H4 + O2 → CO2 + H2O

If a gaseous mixture is made by combining 3.78 g Ar and 3.27 g Kr in an evacuated 2.50 L container at 25.0 ∘ C, what are the partial pressures of each gas, P Ar and P Kr, and what is the total pressure, P total, exerted by the gaseous mixture?

I have 2 electrons is the first shell, 8 in the second, and 6 in the third

The production of plastics makes life, so it benefits society. On the other hand, the production of plastics causes air and water, so it also harms society.

The total number of moles represented by 20 grams of CaCO3 is

Particles of matter how have both potential and kinetic energy is that true or false?

Visible light waves are part of the blank Spectrum