Hydrogen (H) is typically placed at the top of Group 1 on the Periodic Table. However, Group 1 consists of the allall metals and hydrogen is not a metal What reason best explains why hydrogen is placed in this group?

A Hydrogen and the other alkall metals have similar physical properties

B Hydrogen was the first element to be discovered so it is placed first on the periodic table

C Hydrogen has the same number of valence electrons as the alkall metals

D There isn't a space available to place hydrogen with the other nonmetals

What are the charges of the subatomic particles by choosing the answer from the drop down menu. protons have a (+1,0,or-1). (protons,neutrons,electrons) have a 0 charge. 3.) electrons have a (+1,0,-1)

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.