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Chapter 9 sec2
| Question | Answer | |
|---|---|---|
| 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