20 points

so i had this experiment where i have to separate several substances from a mixture. one was separating iron filings from sand and the next question was:

why might this be important on an industrial scale?

How will the emission of an alpha particle affect the atomic number of an atom

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?

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