Which of these period 3 elements (Al, At, CL, Si) from the periodic table would you predict to be the most metallic

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm

Assignment directions: pick one of the following chemists and perform a bit of research on him/her. answer the following questions. alice hamilton             rosalind franklin marie curie             gertrude b. elion ada yonath             henry cavendish robert boyle             antoine lavoisier mario j. molina             svante arrhenius