An electron in a Bohr hydrogen atom has an energy of -1.362*10^-19 J. The value of n for this election is ___.

A. 1
B. 2
C. 3
D. 4
E. 5

Can anyone explain for me how to solve this kind of questions? Thanks in advance!

indium, and thallium have three electrons i think

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

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.