What is the electron structure of a beryllium ion with a net ionic charge of + 2?

1s1

1s2

2s1

2s2

What must happen to nitrogen before it can be used

Why do the atoms in a molecule want to be so far apart? (Mention Electron domains/Electrons)

What does the speed of an object tell you about the object's motion

In an oxygen molecule, the two oxygen atoms are held together by a double bond with a bond energy of 495 kJ/mol. Using the balanced chemical equation (shown above), how much energy must be expended in breaking the O=O bonds?

The following choices contain densities of various materials. Based on these data, which will yield the fastest seismic velocity? A. 3.3 g/cm3 B. 2.7 g/cm3 C. 3.0 g/cm3 D. 5.6 g/cm3

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.

A gas stream contains 18.0 mol% hexane and the remainder nitrogen. the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. the hexane mole fraction in the gas stream leaving the condenser is 0.0500.

What type of solution is aerated water. why is it so.

What elements form chemical bonds

Which of the following is not a pseudoscientific claim