Elements are arranged in groups by similar atomic structure on the periodic table. this allows for an elements properties to be predicted based on general periodic trends. one of these trends, atomic radius, increase down a group and to the left along a period and can be defined as

a). one-half the distance between the nuclei of two atoms

b). the distance between the nuclei of two atoms

c). one-half the diameter of an atom

d). the diameter of an atom

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)

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