The Periodic Table and energy Flashcards
(i) The periodic table: periodic and group properties (ii) Enthalpy changes and their determination (iii) Rates of reaction (iv) Reversible reactions and chemical equilibrium (v) Consideration of energy and yield in improving sustainability.
What is Periodicity?
It is a pattern of repeating trends across periods
What is the periodic trends for electron configuration across periods?
Across periods, each successive elements gains one electron
What is the periodic trends for electron configuration down a group?
Down a group, the number of electrons in each outermost shell and type of sub shell stays the same
What is Ionisation energy?
it is the energy needed to remove electrons
Factors affecting IE
Atomic radius
Nuclear charge
Electron shielding
How does Atomic radius affect IE
The bigger the atomic radius, the smaller the attraction and so the smaller than IE
How does Nuclear charge affect IE?
The more positive the nucleus is, the greater the attraction and so the greater the IE
How does Electron Shielding affect IE?
The greater the number of shells, the greater the shielding and the weaker the attraction
What is the first ionisation energy?
It is the energy needed to remove 1 mole of electrons from 1 mole of gaseous atom to form one mole of gaseous 1+ ions
