What is the mass number of an element that has 8 protons, 9 neutrons and
7 electrons?

The diagram below shows a cell placed in a solution. a cell is shown placed inside a beaker. it is labeled cell. the solution inside the beaker is labeled 40% salt solution and the solution inside the cell is labeled 20% salt solution. only water is allowed to move in and out of the cell. what will most likely happen to the cell? it will expand as water moves out of it. it will shrink as water moves out of it. it will expand as water moves into it. it will shrink as water moves into it.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

What are the similarities between compounds and mixtures?