When two or more different elements chemically combine they form . An example is H2O.

Put these processes of the water cycle in the correct order, starting at the point where the water is in the lake: 1. water evaporates into the atmosphere 2. rain, snow, or other precipitation falls 3. water collects into larger bodies of water 4. water vapor condenses into liquid water

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc