What do all elements in a column in the periodic table have in common? 1. their atoms have the same number of valence electrons. 2. their atoms have the same atomic mass. 3. their atoms have the same number of protons and electrons. 4. their atoms have the same number of neutrons.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Which of the following is an example of units for speed

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.