Atomic structure

What are isotopes?

• atoms with the same number of protons but a different number of electrons

• atoms with the same number of protons but a different number of neutrons

• atoms with the same number of neutrons but a different number of protons

• none of the above

What evidence do line emission spectra provide for the existence of energy levels in atoms?

• different elements have the same t distribution of energy levels and so the same emission spectra

• the emission spectra only provide information about the mass of each atom

• the emission spectra are only relevant for the lighter elements where there are less electrons

• different elements have a distinct distribution of energy levels and so a distinct emission spectra

The Aufbau principle states that:

• electrons enter the lowest available energy level

• electrons enter one orbital at a time

• electrons enter an orbital in the highest energy level available

• electrons only enter the lowest energy level if the ones with a higher energy are full

Electrons have a discrete (fixed) amount of energy.

• True

• False

The lowest available energy state of an electron is called the:

• the lowest state

• the ground state

• the entry state

• the fixed state

When atoms receive energy, the electrons:

• jump to a higher energy level and fall back to a lower one, emitting energy in the form of light of a specific frequency in the process

• jump to a higher energy level and fall back to a lower one, emitting energy with a varied frequency each time

• do not absorb the energy, it gets absorbed in the nucleus instead

• jump to a higher energy level and fall back to a lower one, emitting energy in the form of heat

Energy levels for an electron in a hydrogen atom are

• randomly arranged

• evenly spaced

• further apart near the nucleus

• closer together near the nucleus

What is the electron configuration of an Iron atom (56-Fe)?

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁷

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴

How many full p-orbitals are there in an atom of Bromine?

• 9

• 11

• 8

• 10

How many orbitals are there in the n = 3 energy level of an atom?

• 4

• 9

• 5

• 6