Why do elements in a vertical column of the periodic table have similar chemical properties? They have the same number of electrons
They have the same number of protons.
They have the same number of outer electrons.
They have equal numbers of protons and electrons.

Bose-einstein condensation occurs at what temperature?

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?