1) what conclusion can be drawn about relationship between the arrangement of elements on the periodic table and the patterns observed in their properties?
a)properties of elements are related to atomic numbers.
b)properties of elements are related to ductility.
c)properties of elements are related to malleability.
d)properties of elements are related to luster.

2) which physical properties are characteristic of metals? choose all that apply
a)brittle
b)high luster
c)malleable
d)ductile
e)not very reactive

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.