Which is the highest reactive non metal a. oxygenb. nitrogenc. phosphorusd. sodium

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 type of electromagnetic waves does the human eye see as the colors red blue or green a visible light waves b radio waves c infrared waves d microwaves

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.