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Chapter 9 sec2

Pure substances that cannot be broken down into any simpler substances. Elements
A substance formed from the chemical combination of two or more elements that then act as a unique substance. Compound
The smallest particle of an element that still has the same chemical properties of the element Atom
The ______ is at the center of an atom and contains most of its mass Nucleus
What two types of particles are in a nucleus Neutrons and Protons
This particle has no electrical charge; they stay neutral Neutrons
This particle has a positive electrical charge Protons
The number of protons in an atom of an element is its Atomic number
The _______ _______ of an element is the number of protons added to the number of neutrons Atomic mass
Atoms of the same element that have different atomic masses are called Isotopes
Atoms also contain _____, which each have a small mass and a negative electrical charge Electrons
The ________ ________ is a chart that shows the elements in order of increasing atomic number Periodic table
Elements belong to 1 of 3 groups, list the three groups Metals, Nonmetals, and Metalloids
________ conduct heat and electricity, become shiny when polished, Melt at height temperatures and can be easily reshaped Metals
_________ have a dull surface, melt at lower temperatures, and tend to break when bent Nonmetals
_______ have some properties of metals and some of Nonmetals. Metalloids
Name a common compound? Table salt
A _______ ________ is a simple way to indicate the composition of elements in a compound Chemical formula
What is the chemical formula for sodium chloride? NaCl
What is the chemical formula for carbon dioxide? CO2
A ________ is the smallest particle of a compound that still has all qualities of that compound Molecule
What does C stand for? Carbon
What does O stand for? Oxygen
What does Na stand for? Sodium
What does Cl stand for? Chlorine
What is the chemical formula for Water? H2O
What does the H stand for Hydrogen
What does the O stand for Oxygen
Who formulated the atomic theory? John Dalton
Who was the Russian scientist that arranged the elements in the order of their atomic masses? Dmitri Mendeleev
What does the word Periodic refer to? A repeating pattern
Created by: Coramae67