Due to follwing reasons:
"Carbon and hydrogen are often included in the reactivity series even though they are non-metals. Carbon is included because this helps to explain what happens in the extraction of iron in a blast furnace. Hydrogen is included because any metal below it will not react with dilute acids."http://www.frankswebspace.org.uk/ScienceAndMaths/chemistry/reactivitySeries.htm
They will not appear on the activity feed unless they have answers from a nonexpert. I believe that the fact that expert answers are not listed on the activity feed is an oversight. Do not worry, they have not been deleted.
Samsung makes a whole range of netbooks, though they are listed on their website as laptops. They make the series 3, 5 and 7 notebook and the series 9 ultrabook.
We arrange metals into an ordered list with the best reducing agent at the top and the worst reducing agent at the bottom. This is an Activity Series for metals. Metals near the top of the list give up electrons most easily. Those metals near the bottom of the list give up electrons with difficulty. Hydrogen, even though it is not a metal, can be placed in the list. Metals above hydrogen in the Activity Series will react with 1.0 Molar hydrochloric acid at room temperature. The Activity Series for metals is developed by experiment.A list of metals arranged in order of reactivity~APEX
No, though the SO4- portion of H2SO4 is. In ionic compounds, the cation (positive ion) will be listed first, in this case, H2. The anion (negative ion) is next, in this case SO4 (a polyatomic ion)
The most reactive metals are found in Group 1 of the periodic table, known as the alkali metals, such as lithium, sodium, and potassium. These metals react vigorously with water and air, often forming ionic compounds and releasing hydrogen gas.
Hydrogen sulfide (H2S) is the most common example, though hydrogen disulfide (H2S2) also exists.
hydrogen has two hydrogen atoms and two oxygen atoms and water has one hydrogen and one oxygen atoms
Technically, no. "Flame" doesn't "react" with anything. Hydrogen gas is flammable, though.
no there is only hydrogen on Neptune, but good answer though ;p
Hydrogen and Oxygen, though it is a compound, not a mixture.
Hydrogen