Before quantum mechanics, scientists envisioned the atomic world as just a ___

In 1913, who developed a model for the energy levels of a single electron in a hydrogen atom?

Which scientist determined that elements only exist in discrete packets of matter?

The energy given off by electrons is emitted in discrete packets called ___

In 1913, Niels Bohr came up with a simple model for describing electron energy levels as ___

Electrons don't really behave like particles; they're better described as ___

For an electron around a nucleus; a standing wave is produced only at certain ___

Who developed a mathematical model where the electron was assumed to be a standing wave?

A bit like the individual notes on a keyboard, electrons exist in ___

The first shell has a single orbital, an s-orbital, which can only fit ___

In total, how many electrons can be held in the p-orbitals of a shell?

The desire for most of the lighter elements to have eight electrons in their outer shell is called ___

The "complete harmony" of a full outer shell is realized in which group of elements?

The condensed way of showing exactly where all of an atoms electrons are located is called ___

For hydrogen, the electron configuration is ___

The electron configuration for fluorine is ___

The third shell adds a third kind of orbital: the five part harmony, with ten electrons, of the ___

What is the next type of orbital to be filled after the 4s orbital?

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶ ?

The energy required to remove an electron from an atom to form a positively charged ion is called ___

When atoms have the same number of electrons, they are called ___

Which type of orbitals are being filled in the lanthanides and actinides?