Which electron configuration represents a selenium atom in an excited state? (1) 2-7-18-6 (2) 2-7-18-7 (3) 2-8-18-6 (4) 2-8-18-7

Does "valence electrons" have a charge?

What science project should i do?

a faucet is leaking water at a speed of 5 drops per minute. If 1 ml is equivalent to 10 drops, how many liters of water will be wasted in one day

Which metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe? which metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe? cu ag al au?

Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes. What is the number of Na + ions in the unit cell? A) 2 B) 4 C) 6 D) 8 E) none of these

1. Which metal is the most reactive? How do you know this?

In addition to burning fossil fuels, humans return co2 to the atmosphere faster than it can be removed by:

A dilute solution contains large amounts of solute. True False

Consider the compound Sn (SO4) 2 and answer the following questions: a. What is the name of this compound? b. What is the molar mass of this compound? Explain how you calculated this value.

If you put a base in water, what will happen? A. it will dissociate B. it will form a covalent bond. C. it will bond with the water molecules