Is lead a mixture or pure substance? and is paint a mixture or pure substance?

If two atoms are bonded to a central atom with no lone pairs, how will they be arranged

What is the most important factor in determining climates.

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.