Which region (s) of the period table contains elements that can adopt both positive and negative oxidation numbers?

Many insulating materials contain spaces filled with air because air is what type of material

The process of cell division that creates sex cells in sexually reproducing organisms is called

1. A neutral atom of fluorine (F) has 9 electrons and an electron configuration of 1s2 2s2 2p5. How will it ionize to achieve an octet in its valence shell? A.

How does the type of surface determine the amount of light reflected?

Which of these relationships is true of an uncharged atom? which of these relationships is true of an uncharged atom? the atomic mass is equal to the number of electrons. the number of electrons is equal to the number of neutrons.

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.