As you move from left to right across a period, what happens to the atomic radii?
they increase, because of the higher number of occupied energy levels.
they increase, because of the weaker attraction of electrons to the nucleus.
they decrease, because of the stronger effective nuclear charge.
they decrease, because of the increased atomic mass.

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit