Britney has four different materials of different masses. She decides to test their electrical conductivity by connecting each in a closed electric circuit and then measuring the amount of current that passes through them. Her results are collected in the table below. Material Mass (g) Current (A) W 10.0 0.0 X 65.0 0.0 Y 23.5 4.0 Z 82.0 0.0 Which material is most likely a metal? A. W B. Z C. Y D. X

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.