Which element is least likely to be metallic A) black powder B) Reddish pellet C) Shiny silver strip. D) Dull gray pellets

air quality

poor drinking water

and heavy polution

can lead to poor health

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

distance, luminosity, brightness, radius, chemical composition, and temperature