Atomic Structure And The Periodic Table Flashcards
(11 cards)
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