when hydrogen is fitted into reactivity series of metals , it comes immediately after
Lead
http://www.files.chem.vt.edu/RVGS/ACT/notes/activity_series.html
lead
To determine where hydrogen fits into the reactivity series of metals, we need to understand what the reactivity series represents. The reactivity series is a list that shows the relative reactivity of metals, with the most reactive metal at the top and the least reactive metal at the bottom.
Typically, the reactivity series of metals is arranged based on their propensity to lose electrons and form positive ions (cations). Metals that are higher in the reactivity series can more easily lose electrons and are therefore more reactive.
Now, let's determine where hydrogen fits into the reactivity series. Hydrogen is not a metal but is often included in the reactivity series because it exhibits some characteristics similar to metals. However, its reactivity is different from that of metals.
Hydrogen is not specifically placed after a particular metal in the reactivity series as it is not a metal itself. Instead, hydrogen is often positioned between metals that are less reactive and metals that are more reactive.
An example of the reactivity series with hydrogen included would be:
1. Most reactive: Potassium (K)
2. Sodium (Na)
3. Calcium (Ca)
4. Magnesium (Mg)
5. Aluminum (Al)
6. Carbon (C)
7. Zinc (Zn)
8. Iron (Fe)
9. Hydrogen (H)
10. Copper (Cu)
11. Silver (Ag)
12. Gold (Au)
13. Least reactive: Platinum (Pt)
Please note that different reactivity series may have slight variations, but hydrogen is generally placed after metals like iron, but before metals like copper and silver.