29) What is one of the major conclusions made from the study of line spectra of Various elements?
)
A)
the movement of electrons outsIde the nucleus
B)
absorption and emission of energy is quantized
the presence of energy beyond the visible spectrum
D)
the presence of electrons outside the nucleus of an atom
Scientists use the emission spectra of elements to detect

Acurium-245 nucleus is hit with a neutron and changes as shown by the equation. complete the equation by filling in the missing parts. 52

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.

What does a numerical subscript following an element in a chemical formula mean?