Elements and the Periodic Table
Terms in this set (36)
the smallest particle of an element that has the properties of that element
a tiny, negatively charged particle that moves around the outside of the nucleus of an atom
the central core of an atom which contains protons and neutrons. Most dense part of an atom.
small, positively charged particle that is found in the nucleus of a cell
a region of an atom in which electrons of the same energy are likely to be found
a small particle in the nucleus of the atom, with no electrical charge.
tells you the number of protons in the nucleus of an atom
the average mass of all the isotopes of an element
An arrangement of the elements showing the repeating pattern of their properties.
a one-or two-letter representation of an element
a horizontal row of elements in the periodic table
elements in the same vertical column of the periodic table; also class family
protons and electrons
which two subatomic particles are always equal in a neutral atom?
atomic mass minus atomic number
how do you find the number of neutrons in an atom?
electrons in the outermost energy level
increasing atomic mass
mendeleev created the first periodic table by arranging
from an element's location in the periodic table, you can predict
number of valence electrons
elements in the same group have the same
number of energy levels
elements in the same period have the same
atom of the same element with a different number of neutrons.
when the number of protons and electrons are NOT the same a _______ is formed.
when an atom gains electrons it has a ____________ charge
when an atom loses electrons it has a ____________ charge
this group of elements is to the left of the zig-zag line
this group of elements is to the right of the zig-zag
elements located along the zig-zag line
a characteristic of metals; ability to be hammered into a new shape without breaking.
a characteristic of nonmetals; easily broken or shattered into pieces.
characteristic of metalloids; usually a solid element that can conduct electricity under some conditions but not others.
most reactive group of metals on the periodic table
only group on the periodic table that is inert or nonreactive
most reactive group of nonmetals
an element has an atomic number of 4 and a mass of 9. The number of neutrons in the nucleus of this atom must be
number of electrons needed to complete the first energy level.
number of electrons needed to complete the second energy level.
8 or 18
number of electrons needed to complete the third energy level.
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