As a trend or pattern, the atomic radius go from left to right across the period but top to bottom down a group

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Think about how you can use le chatelier’s principle to find possible solutions to the design problem. describe at least two ways to increase the yield (amount) of ammonia based on this principle.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays