Can I get some help please

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next