Atomic structure and the periodic table Flashcards
What is a period
A period is a horizontal row of elements in the periodic table
What is shielding
Shielding is an effect of inner electron which reduce the pull of the nucleus on the electron in the outer shell of an atom
Define ionisation energy
The energy needed to remove one mole of electron from one mole of gaseous atom or ion or an element
What does the electron configuration of an element describes
It describe the number of electron and it’s arrangement
What is sub-shell
Sub-shell are sub-division of electron shells in atom labelled s,p,d,f
What is atomic orbitals
It is a division of sub shell. An atomic orbital is a region in space around the nucleus of an atom in which there is a 95% chance of finding an electron
What is the 3 feature that define an atomic orbitals
*Energy level
*Shape
*Direction in space
What is atomic energy level
Energy of electron in atom
How does heating an atom affect its electron
Is give the atom energy which make some of the electron jump to higher energy level
By careful interpreting the data from mass spectrometer, chemist can deduce: __________, __________ and ________
*The isotopic composition of element
*The relative atomic masses of element
*The relative molecular mass of compound
The combination of _____ and _____ is particularly important in modern chemical analysis
Gas chromatography and mass spectrometer
How does gas chromatography and mass spectrometer use in modern chemical analysis
Chromatography is first used to separate the chemical in an unknown mixture, such as polluted water or similar compounds synthesised for possible use as drug. Then mass spectrometer is used to detect and identify the separated component
Define relative molecular mass
The RMM of an element or compound is the sum of the RAM of all the atom in its molecular formula
Why does relative formula mass being use
To avoid the suggestion that their formulae represent molecules for metal compound consist of giant structures
The ionisation energy of an atom is determined by which 3 properties
*The size of the + nuclear charge
*The distance of the outermost electron from the nucleus
*The shielding effect of electrons
