Atoms, Elements And Compounds Flashcards
1
Q
What is an atom?
A
Smallest part of an element that can exist
2
Q
Atoms of each element are represented by a ____________________
A
Chemical symbol
3
Q
There are about _________ different elements
A
100
4
Q
Compounds are formed from elements by _________________________
A
Chemical reactions
5
Q
Compounds contain 2 or more elements that have been _____________________________ in fixed proportions and can be represented by _____________ using the symbols of the atoms from which they were formed
A
Chemically combined
Formulae
6
Q
Compounds can only be separated into ______________ by __________________________
A
Elements
Chemical reactions
7
Q
Name 4 diatomic elements
A
Fluorine Chlorine Bromine Iodine Astatine Oxygen Hydrogen Nitrogen
8
Q
Symbol equation for
Bromine + sodium
To
Sodium bromide
A
Br + 2Na
2
To
2NaBr
