The chemical reactivity of metals tends to increase from left to right across the periodic table. true or false

False.

Explanation:

The metal elements are located further to the center and to the left of the Periodic Table. To know if one metal is more reactive than another, it is important to remember the concept of electropositivity, that is, the ability of one atom to give electrons to another atom during a bond.

Thus, if one metal is more electropositive than another, it is more likely to lose electrons in a bond and therefore tends to be more reactive. As electropositivity follows the pattern of increasing atomic radius, to evaluate the reactivity of metals in the Periodic Table, we will follow the same principle, namely:

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.