How many possible orbitals are there in the second principal energy level (n = 2) ?

2

3

4

5

How many different types of crystals are there and what are they?

Bromine is a red-orange liquid with an average atomic mass of 79.90 amu. Its name is derived from the Greek word bromos, which means stench. It has two naturally occurring isotopes: Br-79 (78.92 amu) and Br-81 (80.92 amu).

Could hydrogen fuel replace fossil fuels in the future? Why or why not?

Given the bond energies below, calculate an estimate for ΔH (kJ) for the reaction: 2CO (g) + O2 (g) - > 2CO2 (g) Bond energy (kJ/mol) : C-O, 360; C=O, 799; CO (triple bond), 1071; O2, 498

Duties that are often performed by pharmacy technician include

Compound made up of only xenon and fluorine contains 22.44% fluorine by weight. what is the molecular geometry of this compound?

Which ions are spectator ions in the formation of a precipitate of agcl via combining aqueous solutions of cocl2 and agno3?

Marissa is learning about the unique properties of waves. She has learned that whenever the wavelength of a wave increases, the frequency of the wave decreases.

Which answer choice best explains why uranium-238 can be used in power plants to generate electricity? A) Nuclides of uranium-238 decay over time. They release large amounts of energy as their nuclei break apart.

Explain how you can use physical properties to compare substances.