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What is a proton number
Number of protons in the nucleus of an atom and indicates the element’s position in the Periodic Table
What is a Nucleon number
Number of protons and neutrons found in the nucleus of an atom of an element
What is an Orbital
Volume of space in which there is a 95% chance of finding an electron
What are Isotopes
Atoms of the same element with the same number of protons, but different number of neutrons
What is The First Ionisation Energy
The enthalpy change required to remove one mole of electrons from one mole of gaseous atoms of the element to form one mole of gaseous unipositive cations
What is The Second Ionisation Energy
The enthalpy change required to remove one mole of electrons from one mole of gaseous univalent cations of the element to form one mole of gaseous dipositive cations
Note 
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