Traner -Atoms and Elements

Created by tnechita Teacher

27 terms · PH Explorer, Chapter 3, Atoms and elements

Nucleus

the center of an atom that contains most of the mass of the atom in the form of positive protons and negative neutrons

Proton

The positively charged (+) particle in the nucleus which determines what element this is an atom of. Example: 1 Proton is the element Hydrogen.

Dmitri Mendeleev

Russian scientist who discovered a logical pattern in the properties of the elements

atomic mass

the average mass of one atom of the element. The mass averages the common form and the isotopes. It is equal to the mass of the protons and the neutrons.

chemical symbol

usually consists of a one or two letter abbreviation of the element name

group or family

elements in a periodic table column that have similar properties

period

elements in a periodic table row and which change properties in a predictable pattern

metal

a type of element that tends to be shiny, hard, malleable, ductile, and a good conductor

malleable

can be pounded into shapes

ductile

can be pulled into wire

reactivity

a description of how easily and quickly an element combines with other elements and compounds

nonmetal

a type of element that lack most of the properties of metals

metalloid

a type of element that has some of the characteristics of metals and some of the characteristics of nonmetals

mixture

when 2 or more ingredients are mixed but do not bond chemically

pure substance

made of one kind of matter and has definite properties, may be a single element or a compound

elements

a substance that cannot be broken into smaller pieces

atom

the "smallest piece of matter" that if broken into smaller pieces, loses its original properties

electrons

negatively charged particles; move around the outside of the nucleus

atomic number

the number of protons in an element's nucleus

periodic table

the chart that organizes the elements

atomic mass unit

special unit used for the mass of a subatomic particle

energy levels

the space around the nucleus in which the electrons travel
2, 8, 18

valence electrons

the electrons in energy level that is farthest from the nucleus; that helps determine which elements atom will bond with.

Isotope

An atom with the same number of protons and a different number of neutrons from other atoms of the same element

ion

an atom that has taken on or lost electrons to become negatively or positively charged instead of neutral

conductivity

the ability of an object to allow heat and electricity to pass through it

corrosion

the gradual wearing away of an element due to a chemical reaction

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