The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead. what is the independent variable and what is the dependent variable?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.