Write down the electron configurations and the box diagrams of the elements [Hydrogen (e = 1) to Calcium (e = 20)] on a piece of paper and
submit a copy of your work.

How many moles of gas are present if p=11 atm, v=12l, t=185k?

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?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?