Ground state means that an electron is...

• at its lowest possible potential energy

• in the first shell of an atom

• laying low for the weekend

• removed from an atom

When an electron returns to ground state from an excited state, the atom will

• emit energy

• absorb energy

• rotate

• wiggle

Tags

NGSS.HS-PS4-3

Which electronic transition would result in ultraviolet region?

• n=3 to n=2

• n=4 to n=1

• n=4 to n=3

• n=6 to n=4

The principal quantum number, n, represents the

• spin value

• suborbital value

• energy level

• magnetic value

A transition of electron from a higher energy level to energy level of n = 5 formed a photon. Which of the following series belongs to this transition?

• Balmer

• Pfund

• Brackett

• Lyman

• Paschen

The impossibility to know simultaneously the exact position and momentum of a particle is called the

• de Broglie's Uncertainty Principle

• Moseley's Uncertainty Principle

• Heisenberg's Uncertainty Principle

• Bohr's Uncertainty Principle

Ionisation energy is ___________.

• maximum energy required to remove 1 electron from 1 mol of gaseous atoms.

• minimum energy required to remove 1 mol of electrons from 1 mol of gaseous atoms/ions.

• first ionisation energy for a mol of gaseous atoms.

• second ionisation energy for 1 mol of gaseous ions.

Which equation show the relationship among wavelength, frequency, and speed of light/radiation?

• $\Delta E\ =\frac{hc}{\lambda}$

• $\Delta E=hv$

• $\lambda\ =\ \frac{c}{v}$

• $En=-\ R_{H\ }\left(\frac{1}{n^2}\right)$

Which formula is used to calculate energy of an electron in a given energy state of the H atom?

• $\Delta E\ =\frac{hc}{\lambda}$

• $\Delta E=hv$

• $\lambda\ =\ \frac{c}{v}$

• $En=-\ R_{H\ }\left(\frac{1}{n^2}\right)$

Which number of line spectrum formed when electron falls down from n=5 to n =3 in Paschen series?

• 3rd line

• 1st line

• 2nd line

• 4th line