Atomic Structure Flashcards
What are the 2 things found inside the nucleus?
Protons
Neutrons
What 2 parts are atoms made up of?
Nucleus - very small and highly dense and in the centre of the atom
Shells - energy levels surrounding the nucleus.
What mass and charge do protons have?
Charge: 1
Mass: 1
What charge and mass do neutrons have?
Charge: 0
Mass: 1
What charge and mass do electrons have?
Charge: -1
Mass: 1
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What is the definition of ‘The Atomic Number’?
The number of protons in the atom of an element (number of protons=number of electrons).
Define ‘The Mass Number’?
The sun of the protons and neutrons in the nucleus of an atom of an element
How do you work out the number of protons in an atom?
The atomic number (bottom number).
How do you work out the number of neutrons?
Mass No. - atomic No. (Top number - bottom number)
How do you work out the No. Of electrons?
The same as the protons
Give the definition of Isotopes…
Isotopes are different atoms of the same element with the same number of protons but a different number of neutrons in their nuclei.
Define the relative atomic mass
The weighted average mass of a atom of an element relative of an atom of Carbon (12) who has a value of 12.0000.
What two isotopes does chlorine exist as?
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Cl : Cl
What is the percentage abundance of clorine?
75%:25%
What is an atom?
Smallest particle of an element
Name the three parts of an atom…
Protons, neutrons, electrons
What is the definition of the PERIODIC TABLE?
An arrangement of ELEMENTS on order of INCREASING ATOMIC NUMBER.
GROUP NUMBER=
Number of electrons in the outer shell
PERIOD NUMBER=
The number of occupied shells.
ELECTRON CONFIGURATION is used for the first … Elements?
20
