In the Periodic Table, a column is called a _____?
What is a group?
100
Formula H2O stands for what compound?
What is water?
100
The central core of the atom is called the ______.
What is a nucleus?
200
The smallest part of an element that still has the properties of than of an element.
What is an atom?
200
An abbreviation of an element is called it's what?
What is a chemical symbol?
200
A compound requires a chemical _____ in order to form.
What is a reaction?
200
What are the three classification of elements on the Periodic Table? In other words, what are the three metallic properties?
What is a metal, nonmetal, and semimetal?
300
Negatively charged particles in an atom are called _____?
What is an electron?
300
These elements are usually shiny, bendable, and can conduct electricity.
What is a metal?
300
A pure substance made up of two or more elements that are chemically combined is called a _____.
What is a compound?
300
Many fats, proteins, carbohydrates, and DNA are made up of these.
What is a polymer?
400
______ are two or more atoms joined together by certain forces of attraction called chemical bonds.
What is a molecule?
400
These elements are usually dull, brittle, and do not conduct electricity.
What is a nonmetal?
400
A _____ ______ is a process in which one or more substances are changed into one or more different substances.
What is a chemical reaction?
400
Liquid at room temperature, unique shape, and ability to dissolve substances are all unique properties of what compound?
What is water?
500
Most of an atom's mass is made up of _____ & _____. A _____ is a particle of a positive electrical charge. A _____ is a particle of no charge.
What are protons and neutrons?
500
Elements that hardly ever combine with other elements to form molecules are called _____?
What are noble gases?
500
Because every molecule in a compound is like every other molecule and has the same properties, allows us to call compounds "______ ______." Another name for a compound.
What is a pure substance?
500
All atoms of an element have the same number of _____ in their nuclei.