Create a one-sentence summary that explains why hydrogen gas does react easily and spontaneously due in 20 minutes help

Hydrogen belongs to group 1 metal elements in the periodic table.

Explanation:

The hydrogen is a highly active metal. It has a single electron in its valence shell and it can donate its electron to other metal atoms. Thus forming metal hydrides.  The hydrogen when ignited it reacts with oxygen and burns explosively this is indicative of high reactivity and spontaneous reactivity of hydrogen atom.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.