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