Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th e percentage abundance of the lighter isotope? Show your working out.

The electron configurations of two different atoms are shown below. each yellow electron has a charge of 1−, and the net charge of each nucleus is shown. these atoms will combine with bond. a. an ionic b. a positive c. a negative d. a covalent plzzz mee with !

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.