Among the groups of elements listed below which have the same number of electrons in their highest occupied energy levels?

A. Li, B, C, F

B. Na, Mg, Al, S

C. K, Ca, Rb, Sr

D. N, P, As, Sb

1. What is the pH of a solution if the [OH-] = 4.0x10-11M?

Does boiling involve the same change of state as freezing?

How does the difference in electronegativity values determine the type of bond that occurred? Ionic or covalent

A 143.1 g sample of a compound contains 53.4 g of carbon, 16.9 g of hydrogen, 43 g of nitrogen, and some amount of oxygen. what is the mass percent of oxygen in the compound? 11.20% 11.81% 20.82% 30.05% 37.34%

4. A burning candle is an example of a chemical reaction taking place. What i can be inferred about this reaction? Choose the correct answer." A. Mass is not conserved. B. The reaction absorbs energy. C. The reaction releases energy D.

What evidence do you have that the slope of the natural logarithm plot will be the same for all ions of the same charge, and not just for the ions you investigated?

How many Oxygen elements are in a carboxylic acid

The number of protons in the nucleus Of an Atom is equivalent to which of the following

What does pH measure? number of hydrogen atoms in an acid number of hydroxide atoms in a base concentration of hydrogen ions in solution concentration of hydroxide ions in solution

Based on charles's law, which of the following statements is true for an ideal has at a constant pressure and mole amount? A. The number of collisions is independent of volume B. The number of collisions decreases with increase in volume C.