Classification of Elements Flashcards
(17 cards)
Which alkali is radioactive
Francium
Which halogen is radioactive
Astatine
What is the general formula for s block elements
ns (1- 2)
What is the general formula for P block elements
ns (2) np (1-6)
What is the general formula for d block elements
(n-1)d(1-10) ns(2)
What is the general formula for f block elements
(n-2)f(1-14) (n-1)d(0-1) ns(2)
What is atomic radius
It is the distance from the centre of the nucleus to the outermost shell of electrons
What is covalent radius for homonuclear molecules
It is half the distance between the centres of the nuclei of two similar atoms held together by a purely covalent bond
What is covalent radius for hetronuclear molecules
It is the difference of the distance between the two nuclei and the covalent radius of one of the atoms in the covalent bond
What is van der waals radius
It is half the internuclear distance between two similar adjacent atoms of adjacent molecules of the same substance in solid state
What is metallic radius
Half of the internuclear distance between two nearest metal atoms in a metallic lattice
State the factors of atomic radius
- nuclear charge
- number of orbits
What is first ionization enthalpy
It is the energy required to remove one valence electron from the outermost shell of an isolated gaseous atom
What is electron affinity
It is the energy released when and electron is added to a neutral gaseous atom to form a monovalent ion
What is electronegativity
It is the relative tendency of an element in a molecule to attract the shared pair of electrons towards itself
What are the factors of electron affinity
- Nuclear charge
- Size of atom
- Electronic configuration
What are factors of ionization enthalpy
- Nuclear charge
- Screening effect
- penetration of orbital
- size of atom
