Question

What metals are more active than hydrogen?

Answer 1

Hint: A reactivity or activity series is the arrangement of metals from most reactive to least reactive. The metals that are above in the reactivity series are able to displace the metals below in the reactivity series making them more reactive. Through this series, the metals reactive than hydrogen can be identified.

Complete answer:
Metals are substances that consist of free electrons in their valence shells. In the periodic table we can find alkali metals being the most reactive followed by alkaline earth metals in the s block. Some other metals are transition metals that are placed in the d block. These metals possess transitional properties of metals.
Reactivity of all the metals is identified through a series called activity or reactivity series. This series contains the order of the reactivity of metals from the highly reactive metals to the least reactive metals. This series has alkali earth metals at the top and the noble metals like gold at the bottom. Hydrogen is kept in the middle for a reference of comparison that separates highly and moderately reactive metals from less reactive metals.
According to the reactivity series, some of the metals that are more active than hydrogen are sodium, potassium, lithium, iron, chromium, nickel, tin, lead. These metals are above hydrogen in the activity series.
Hence, metals more active than hydrogen are sodium, potassium, lithium, iron, chromium, nickel, tin, lead.

Note:
There are metals that are less reactive than hydrogen, which are at the bottom of the activity series. These metals are gold, copper, platinum, silver, they are called noble metals. The activity series is used to determine which metal can displace a metal in the aqueous solution, as metals above can replace the metals below in this series.