Chapter 4: Electronic Structure of Atoms

Question 1

Define energy level

Answer 1

An energy level is a region of definite energy within the atom that electrons can occupy

Question 2

Heisenberg Uncertainty Principle

Answer 2

The Heisenberg Uncertainty Principle states that it is not possible to determine at the same time the exact position and velocity of an electron

Question 3

Define atomic orbital

Answer 3

An atomic orbital is a region in space where the probability of finding an electron is relatively high

Question 4

Define energy sublevel

Answer 4

An energy sublevel is a subdivision of an energy level containing one or more atomic orbitals all of which have the same energy

Question 5

Define atomic radius

Answer 5

The atomic radius of an element is half the distance between the nuclei of two atoms of the element that are joined together by a single covalent bond

Question 6

Define first ionisation energy

Answer 6

The first ionisation energy of an element is the minimum energy in kilojoules required to remove the most loosely bound electron from each isolated atom in a mole of the element in its ground state

Question 7

Define second ionisation energy

Answer 7

The second ionisation energy of an element is the minimum energy required to remove the most loosely bound electron from each singly charged positive ion in a mole of these ions.