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Flashcards in Chapter 2 Deck (32):
1

atom

The smallest particle of an element

2

atomic mass unit

A unit of mass used to describe atoms and molecules, approximately equal to the mass of a proton or a neutron.

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Atomic number

The number of protons in an atom, used to identify the element

4

Atomic weight

The average mass of all atoms of an element on Earth

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Avogadro's number

The number of particles in one mole

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Chemical formula

A way to represent the numbers and types of atoms in a chemical compound

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Chemical substance

A substance that is made from two or more elements in a fixed ratio

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Electrically neutral atom

An atom that has no electrical charge

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Electron

A subatomic particle; the negatively charged component of atoms

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Element

A substance that cannot be broken down into other substances

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Extensive property

A properties who numerical value depends o the amount of substance, such as mass or volume

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formula unit

A group of atoms corresponding to a chemical formula

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Formula weight

The mass of a single formula unit

14

Heterogeneous Mixture

A mixture that contains two or more visibly distinct components

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Homogeneous Mixture

A mixture in which all components are evenly distributed

16

Intensive property

A measurable property that does not depend on the amount of substance, such as density

17

Isotope

Atoms of the same element that have a different set of neutrons

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Mass number

The total number of protons and neutrons in an atom

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matter

anything that has a mass

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metal

an element or mixture of elements characterized by shiny appearance, ability to be molded without breaking, and conduct heat and electricity

21

Mixture

A combination of two or more substances in which the relative amounts of the substances can be varied

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mole

An amount of a substance equal to its formula weight expressed in grams: 6.022x10^23

23

neutron

A subatomic particle; the electrically neutral component in atoms

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noble gas

an element in group 8A

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non-metal

An element characterized by dull appearance, brittleness,and does not conduct heat or electricity

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nucleus

The cluster of protons and neutrons at the center of an atom

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period

The elements in horizontal row of the periodic table

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periodic table

A table that arranges the chemical elements based on their chemical properties

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property

anything about matter that can be measured or observed

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proton

a subatomic particle; the positively charged components of atoms

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representative element

An element in groups 1A through 2A or 3A through 8A

32

Subatomic particles

A proton, neutron, and electron; one of the three particles that make up an atom