Describe the characteristics of a double replacement reaction, how it is identified, and types of compounds in the reactants and products. Give an example in your response.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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