Pls help!! 20 points A particular reaction has an activation energy, Ea, of 189 kJ/mol. If the rate constant for the reaction is
0.00205 s-1 at 457 °C, at what temperature (°C) would the rate constant be 0.200 s-1?

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.