Chapter 1 - Atomic Structure And The Periodic Table Flashcards Preview

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Flashcards in Chapter 1 - Atomic Structure And The Periodic Table Deck (12):
1

Atomic number

(Z) of an element is the number of protons in the nucleus of an atom of that element

2

Mass number

Sum of the number of protons and the number of neutrons in the nucleus of that atom

3

Isotopes

Atoms of the same element with different masses

4

Relative atomic mass

Weighted mean (average) mass of an element compared to 1/12 of the mass of an atom of carbon-12

5

Relative isotopic mass

Mass of an individual atom of particular isotope relative to 1/12 of mass of atom of carbon-12

6

Molecular ion peak

Peak w highest m/z ration in mass spectrum

7

Orbital

Region within atom that can hold up to two electrons with opposite spins

8

Electronic configuration

Shows number of electrons in each sub level in each energy level of atom

9

Hund’s rule

States that electrons will occupy orbitals singularly before pairing takes place

10

Pauli exclusion principle

States that two electrons cannot occupy an orbital unless they have opposite spins

Electron spin shown by use of upward and downward arrows

11

First ionisation energy

Energy required to remove an electron from each atom in one mole of atoms in the gaseous state

12

Second ionisation energy

Energy required to remove an electron from each singly charged positive ion in one mole of positive ions in the gaseous state