Unit 4.1 - Atoms and Elements Flashcards
(8 cards)
1
Q
How are atoms seen?
A
Through STM - Scanning Tunnelling Microscope
2
Q
What is a nucleus and what makes it up?
A
Nucleus is the centre of each atom. It is made up of protons and neutrons
3
Q
Electron Configuration
A
Arrangement of electrons in electron shells (2,8,18,32)
4
Q
Element
A
A substance composed of atoms with the same atomic number; 118 known to exist
5
Q
Ground State
A
The lowest energy arrangement of an atom’s electrons in the electron shells
6
Q
Indirect Evidence
A
Evidence that does not involve direct observation
7
Q
What are Atoms ?
A
Atoms are the particles that make up all the substances in the universe
8
Q
Isotopes
A
Isotopes are the atoms of an element with different numbers of neutrons, they have the same proton number, but different mass number
