BTEC Applied Science: Unit 20 Learning aim C

BTEC Applied Science: Unit 4 Learning aim A


Atomic No.= - ANSWER Number of protons

Relative atomic mass= - ANSWER Number of protons + Number of Neutrons

Sub-shells of electrons - ANSWER S,P,D

Orbitals - ANSWER Regions of space that electrons are most likely to fill

The maximum number of electrons an orbital can hold - ANSWER Two

Number of Orbitals in the S subshell - ANSWER 1

Number of Orbitals in the P subshell - ANSWER 3

Number of Orbitals in the D subshell - ANSWER 5

Electrons enter the ? energy orbital available - ANSWER lowest

Electrons prefer to occupy orbitals ? - ANSWER on their own

S block - ANSWER Groups 1+2

D block - ANSWER Transition metals

P block - ANSWER Groups 3-8

Concentration (moldm-3) = - ANSWER number of moles/volume(dm3)

? are lost when an ion is formed - ANSWER The highest energy electrons

The energy required to remove one electron from one mole of a gaseous atom -
ANSWER First Ionisation energy

Ionisation energy down groups - ANSWER Decreases because more shielding,
easier to lose one electron

Ionisation energy across periods - ANSWER Increases because more nuclear
charge, harder to lose one electron

Ionic Bonding - ANSWER Between metals and non-metals, gaining or losing
electrons.
Strong electrostatic force of attraction between oppositely charged ions.

Covalent Bonding - ANSWER Between non-metals, sharing electrons .
Strong attraction between two positive nuclei and shared pair of electrons.