C1: Atomic structure Flashcards
Atoms
Tiny particles that are in all substances or are the building blocks of matter
Elements
Substances that are only made up of one type of atom
Periodic table
All elements represented by a symbol in a table and are put in groups e.g: the alkaline metals
Compounds
Different types of atoms that are bonded together
Groups
Sections in the periodic table containing elements that have similar chemical properties
Nucleus
The centre of every atom
Electrons
Orbit around the nucleus in an atom
What was the ancient greek belief of the atom?
That there were 4 elements: earth, air, wind and fire
What was John Dalton’s theory?
Dalton said that atoms were tiny solid spheres and that each element had it’s own type of sphere
What did JJ Tompson discover?
He discovered the electron and that it was negatively charged and they were embedded in the positively charged atom.
What was the model JJ Tompson used?
The plum pudding model
What did earnest rutherford discover?
He discovered that the positive charge in an atom was located at the centre
What was Earnest rutherford’s model?
The nuclear model
What did Niels Bohr discover?
He further modified rutherford’ idea by and suggested that electrons orbit the nucleus like planets do in teh solar system
What was niels nohr’s model?
The planetary model
