Atoms
Elements
Periodic Table
Chemical Reactions
Element Properties
100
An atom is
What is the smallest unit of an element?
100
An element is
What is a substance that cannot be separated or broken down into simpler substances?
100
The order of elements arranged in the modern periodic table is based on this number
What is atomic number?
100
When energy or heat is added into a chemical reaction
What is endothermic reaction?
100
Elements are arranged in in these ways on periodic table, going down a column and across a row
What is a group and period?
200
Three subatomic particles of an atom
What is Proton, Neutron, Electron?
200
The element for "O"
What is Oxygen?
200
These are found on the periodic table
What is an element?
200
A school bus burning gas as it drives students to school giving off exhaust fumes is an example of what
What is exothermic reaction?
200
As you move down a group on the periodic table, this increases
What is electron shells?
300
These 2 subatomic particles make up the nucleus of an atom
What is proton and neutron?
300
The element for symbol "C"
What is Carbon?
300
Atomic number represents the number of what
What is protons?
300
In chemical reactions atoms cannot be what
What is created and destroyed?
300
The outermost electrons in an atom are called this
What are valence electrons?
400
This subatomic particle has a negative charge
What is an electron?
400
The element for symbol "Be"
What is Beryllium?
400
Atomic mass represents the total number what
What are protons and neutrons?
400
The starting materials in a chemical reaction or equation
What is reactant?
400
The starting materials in a reaction or equation
What is reactant?
500
These 2 subatomic particles are attracted to one another
What is a proton and electron?
500
The element for symbol "He"
What is Helium?
500
What is 7?
500
In a reaction, everything to the right of the equation is called this
What is product?
500
Nonmetals are found on this side of the periodic table
What is the right side?