Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
|
What is an atom made up of ? |
Sub-atomic particles called protons, neutrons and electrons. |
|
|
Atomic number |
The number of protons the atom has in its nucleus. |
|
|
Why are atoms electricly neutral? |
They have the same amount of protons as electrons. |
|
|
Mass number |
The protons plus the number of neutrons in its nucleus. It is the larger number below the element symbol in the periodic table. |
|
|
Isotopes |
Are atoms of the same element which have different numbers of electrons. |
