Periodic Table
Fire, water, wind, and earth.
What did scientists originally believe to be the main elements?
chemical bonds
What holds chemicals together?
The smallest particle an element can be divided into.
What is an atom?
A negatively charged particle.
What is an electron?
small particles
What is matter made up of?
Increasing order of atomic number.
What are the elements in the Periodic Table organized by?
A change where a new substance is formed.
What is a chemical reaction?
A neutron.
What is a particle with no charge?
The energy needed to start a chemical reaction.
What is activation energy?
Matter can't be created or destroyed.
What is the Law of Conservation of Mass?
Metals, metalloids, and nonmetals.
How are elements classified in the Periodic Table?
Sodium Chloride
What is made when you chemically combine sodium and chlorine?
The scientist who named the atom.
Who is Democritus?
A reaction where energy is taken in.
What is an endothermic reaction?
Matter and energy.
What does mass connect?
A group/family in the Periodic Table.
What is a column of elements called?
What do chemical reactions do to run a car?
The space around the nucleus of an atom where electrons rotate.
What is the electron cloud?
The part of an atom where protons and neutrons are located.
What is the nucleus?
Element with the symbol Ba.
What is barium?
A Russian chemist who created the earliest version of the Periodic Table.
Who was Dmitri Mendeleev?
Salts and metals.
What do pyrotechnicians add to black powder to create color and twinkle?
Who is J.J. Thomson?
The number of an element's protons.
What is an atomic number?
An element with 83 protons.
What is bismuth?