Chemistry Part 1-Structure and Periodic Table
Terms in this set (34)
a subatomic particle that has a positive charge, has roughly 1 amu and is found in the nucleus
a subatomic particle that has no charge and that is found in the nucleus of an atom.
a subatomic particle that has a negative charge and roughly 0 amu. Located in energy levels inside electron cloud
area around the nucleus of an atom where the atom's electrons are most likely to be found
Located in the center of the atom and consists of protons and neutrons. The nucleus has a positive charge and very dense
Identifies the element and is equal to the number of protons as well as being equal to the number of electrons
Electrons in outermost energy level. The group number on the periodic table is equal to these..
Atomic Mass Number
Protons + Neutrons
They surround the nucleus and electrons fill in levels in this order 2, 8, 8.
Building blocks of matter, the smallest part an element can be divided into and still be an element
normal atoms are neutrally charged resulting from equal numbers of protons to electrons. Occasionally, an atom will gain or lose an electron(s) thus becoming an ion.
a pure chemical substance consisting of one type of atom distinguished by its atomic number.
These rows run horizontally. Rows on the periodic table in which many patterns of the elements increase or decrease across the table. Each tells you how many rings are on the Bohr Model for the elements in that row.
Atomic Mass Unit (AMU)
the SI unit created to measure the mass of an atom
the three particles that make up an atom, therefore they are smaller than an atom (protons, electrons, neutrons)
one or two letter abbreviations for chemical elements; all unique to their own element
orbital rings surrounding the nucleus that electrons travel on-each level has a holding capacity (ex. Ring 1=2 electrons, Ring 2=8 electrons)
1897 british; created catode-ray tube; concluded smaller particles inside atoms are called electrons
British physicist (born in New Zealand) who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937)
1913-discovered that electrons move around the nucleus in orbits called electron clouds in different energy levels.
A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alkali-earth metals, shiny, good conductor of thermal energy and electrical current, high density
Column 18; Most un-reactive group; Full outer shell.
A negativley charged, fast moving particle with an extremely small mass that is found in all forms of,matter and moves through the empty space surrounding an atoms nucleus
A positively charged particle in the nucleus of an atom; contributes to the mass of the atom
A subatomic particle that has no charge and that is found in the nucleus of an atom
A vertical column of elements in the periodic table; elements in a group share chemical properties.
A horizontal row of the periodic table; all elements in the same period share the same number of energy levels but do NOT share properties
How readily a substance combines chemically with other substances. Determined by the number of valence electrons.
A characteristic of a substance that describes its ability to change into different substances.
Atoms tend to gain, lose or share electrons so as to have eight electrons in their outer electron shell.
Left side of periodic table. Properties: shiny (luster), good conductor of electricity, and malleable
not good conductors of electricity, dull and brittle
separate the metals and non metals. Have properties of both metals and non metals.