Eletronic configuration Flashcards
What is the order for electronic configuration in terms of
s , p , d ?
1s2 , 2s2 , 2p6 , 3s2 , 3p6 , 4s2
What is ionisation energy ?
The energy required to remove electrons
What is First ionisation energy ?
The energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of gaseous +1 ions
Write down the first 2 ionisation energies for magnesium ( Mg )
Mg (g) –> Mg+1(g) + e
Mg+1(g) –> Mg+2(g) + e
What is the history of atoms
( John Dalton , JJ thompson , Ernest Rutherford , Neils Bohr , Today )
John Dalton - Atoms are spheres , elements made from different spheres - these spheres are indivisible
JJ Thompson - Discovered electron , the atoms made up of other particles . plum pudding model ( ball of positive charge with electrons embedded inside )
Ernest Rutherford - Discovered nucleus , atom mostly empty space . conducted gold leaf experiment in witch he shot alpha particles at gold leaf and most particles went through concluding most atom is empty
Neils Bohr - Said electrons could collapse into positive nucleus , therefore electrons must be in fixed energy shells - When EM is absorbed , electrons move between shells
What is relative atomic mass
Average mass of an atom of an element compared to carbon 12
What is relative isotopic mass
Average mass of an atom of an isotope compared to carbon 12
What is relative molecular mass
Average mass of a molecule compared to carbon 12
Describe the ionisation trends in Group 2
Ionisation energy decreases as we go down the group
this is because outer electrons are further away from the nucleus so the force of attraction is weaker
also shielding increases as we go down the group as theres more shells , more shells between nucleus and electron
Describe the ionisation trends in Period 3
ionisation energy increases as we go across a period as we go across the period the number of protons in nucleus increase so this increases the nuclear attraction .
