Atoms
What are atoms?
Smallest building block of life
What is an element made of?
Only one type of atom
What is a compound?
A substance made of two or more elements chemically combined
What does each square on the periodic table represent?
An element
What are the three main parts of an atom?
Protons, neutrons, and electrons
What is the chemical symbol for oxygen?
O
What elements make up water (H₂O)?
Hydrogen and oxygen
What are the vertical columns on the periodic table called?
Groups
Where are protons and neutrons found in an atom?
In the nucleus
What is the name of the element with the symbol “Na”?
Sodium
What’s the difference between a mixture and a compound?
A compound has elements chemically joined; a mixture does not
What are the horizontal rows on the periodic table called?
Periods
What is the charge of an electron?
Negative
How many elements are there approximately on the Periodic Table?
About 118
What does the formula CO₂ represent?
Carbon dioxide
Which element has the chemical symbol “Fe”?
Iron
If an atom has 6 protons, what element is it?
Carbon
What do we call a substance that cannot be broken down into simpler substances by chemical means?
An element
True or False: Compounds can be separated by physical means.
False
Why are elements in the same group similar?
They have the same number of electrons in their outer shell