Atoms
What is matter composed of?
Atoms
How many categories is the periodic table divided into?
3
What is a molecule?
Group of atoms bonded together
Are all molecules compounds?
No
What is the center of an atom called?
Neutron
What are the COLUMNS (vertical) called in the periodic table?
Groups
Do electrons fly around the nucleus on an orbital path?
Yes
Describe the difference between physical and chemical changes.
Physical: a change where the chemical properties are not altered. Chemical: a change where the chemical properties are changed and one or more than one new substance is formed.
Positively charged particle located inside the nucleus
Proton
What are the ROWS (horizontal) called in the periodic table called?
Periods
Who was the FIRST to discover the atom?
Democritus
What happens when you heat ip or cool down a liquid?
When it’s heated up, it will become a gas. When it’s cooled down, it will become a solid.
Negatively charged particle floating around the nucleus
Electron
Who made the periodic table?
Dmitri Mendeleev
Who is known as the “Father of Atoms?”
John Dalton
How do you find the # of neutrons in an element?
Subtract the atomic # from the atomic mass
Have no charge and located in the nucleus
Neutron
How is the atomic number of an element determined?
# of protons
How is the periodic table organized?
Size (smallest to largest)
What's the difference between atomic # and atomic mass?
Atomic # is # of protons and atomic mass is how much the atom weighs