Chemical Formulas

Compound or Element?

• compound

• element

What determines the IDENTITY of an element?

• protons

• electrons

• neutrons

• valence electrons

What are the arrows pointing to?

• coefficient

• subscript

How many hydrogens atoms are there in

H₂SO₄

• 2

• 3

• 6

• 7

How many oxygens are in Al₂(SO₄)₃

• 3

• 4

• 12

• 17

How many atoms of nitrogen are present in this molecule?

• 2

• 3

• 5

• 6

Why is Group 18 said to be NONREACTIVE?

• all elements have 8ve

• all elements are liquid and stable

• the outer shell is full

• all elements are flammable

What is the arrow pointing to?

• coefficient

• subscript

How many nitrogen atoms are in this compound?

• 2

• 4

• 8

• 7

• 21

How many valence electrons (ve-)?

• 1

• 3

• 10

• 11