a substance that cannot be broken down into any other substance. a) atom b) element c) compound
b) element
Elements are represented by letters from the alphabet a) atoms b) symbols c) compounds
symbols
symbol for an element is ...
a single capital letter or a capital letter followed by a lower case letter.
Symbol: Na What element is it?
sodium/natrium
Symbol: C What element is it?
carbon
What are the only two letters of the alphabet to not appear on the periodic table?
Q and J
a substance that contains atoms of two or more different elements. a) atom b) molecula c) compound
a compound
How do we call the number that we write next to the element?
subscript
How many atoms are there in this molecule? H4SO2
7
