Which family in the periodic table has metals that are usually harder than other metals?
a. alkali metals
b. alkaline earth metals
c. lanthanide series
d. transition metals

Option-(C): Lanthanide series.

Explanation:

Lanthanide are those elements which can be referred to as those elements inside the periodic table which are still unsettled and needs there proper place inside the periodic table.

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

chemistry sucks a**

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