Which elements, when they have to, can have more than

eight electrons around them? How is this rationalized?

The energy-level diagram shown here can be continued to higher energies. The next few orbitals, in order of increasing energy, are σ3s, σ3s*, π 3p, σ3p, π 3p * and σ3p*; in other words, the σ2s to σ2p * pattern is repeated.

The reason for the dramatic decline in the number of measles cases from the 1960s to 2010 in the United States was because the vaccine

For this ionic compound, what would be the name of the anion? Ca (NO3) 2 A. nitrite B. nitrate C. calcite D. sulfate

Consider the following elementary steps that make up the mechanism of a certain reaction: 3X→E+F E+M→F+N Part A What is the overall reaction? Express your answer as a chemical equation.

What volume of 0.250 M nitric acid is needed to neutralize 17.35 mL of 0.195 M KOH solution?

What type of mixture is 100 ml of water with a little bit of salt?

Which statement explains why meiosis haploid cells rather than diploid cells

Which factors can affect the amount of coco mix that can be dissolved in water? Check all that apply

If 25% of a radioactive element remains after 1,000 years, what is the half-life?

How many valence electrons do the alkaline-earth elements have? a. 1 b. 2 c. 7 d. 8