D: Which of the following best describes how ionic radius changes across the periodic table?
A It increases as you move down a group.
B It increases as you move up a group.
C It increases from left to right across a period.
D There is no identifiable pattern.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?