Atomic Structure And The Periodic Table Flashcards
What is the nucleus of an atom
It is in the middle of the atom It contains protons and neutrons It has a positive charge It is almost the whole mass of the atom But only a tiny part of the atom
What are electrons
They move around the nucleus They are in shells They have a negative charge They are tiny and have very little mass but move over a big area Their relative mass is 1/2000
What are protons
They’re positive
They are in the nucleus
They have a mass of 1
What are neutrons
They are neutral
They are In the nucleus
They have a mass of 1
How do you work out the number if protons and electrons
They are the same as the atomic number
How do you find the number of neutrons
The mass number - the atomic number
How many electrons can be in each shell
2
8
8
What are isotopes
Different atomic forms of the same element
They have the same number of protons but a different number of neutrons
How do you work out the relative atomic mass of an element
(Ram of Isotope X amount) + (ram of Isotope X amount)/
Sum of relative abundance
Why was the periodic table so helpful
It could predict what undiscovered elements would be like
What are the groups called and their charges
Alkali metals +1 Group 2 +2 Group 3 +3 Group 4 Group 5 -3 Group 6 -2 Halogens -1 Noble gases 0