Module 2 DEFINITIONS

Question 1

Relative isotopic mass

Answer 1

Mass of an isotope relative to 1/12 of mass of C12

Question 2

Relative atomic mass

Answer 2

Weighted mean mass of an element relative to 1/12 mass of C12

Question 3

Shells

Answer 3

Energy levels made up of orbitals

Question 4

Orbital

Answer 4

Region around nucleus that can hold up to two electrons with opposite spins

Question 5

Ionic bonding

Answer 5

Electrostatic attraction between positive and negative ions. Hold cations and anions in ionic compounds.

Question 6

Covalent bonding

Answer 6

Strong electrostatic attraction between a shared pair of electrons and nuclei of bonded atoms

Question 7

Dative covalent bond

Answer 7

Covalent bond in which a shared pair of electrons supplied by one of bonded atoms only (eg. Donate a lone pair of electrons)

Question 8

Electronegativity

Answer 8

Measure of an atoms ability to attract shared electrons in a covalent bond

Question 9

Intermolecular forced

Answer 9

Weak interactions between dipoles of different molecules eg, hydrogen bonds, permanent or induced dipole Dipole

Question 10

Hydrogen bond

Answer 10

Type of permanent dipole dipole interaction between electronegative atom eg. O,F,N and hydrogen attached to an electronegative atom.