Which scientist developed this model?
John Dalton
Which scientist developed this model?
J.J. Thomson
Which scientist developed this model?
Ernest Rutherford
Which scientist developed this model?
Niels Bohr
Which scientist developed this model?
James Chadwick
Who discovered the electrons
J.J. Thomson
Who discovered the nucleus and protons
Ernest Rutherford
Who discovered that electrons are found in specific orbits
Niels Bohr
Who discovered the neutron
James Chadwick
the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
Atom
a tiny, negatively charged particle that moves around the outside of the nucleus of an atom
electron
Small, positively charged particles that are found in the nucleus of an atom
Proton
A small particle in the nucleus of the atom, with no electrical charge
Neutron
The central core of an atom which contains protons and neutrons
nucleus
A region of an atom in which electrons of the same energy are likely to be found
Energy Level
The number of protons in the nucleus of an element
Atomic Number
The average mass of all the isotopes of an element
Atomic Mass
An atom with the same number of protons and a different number of neutrons from other atoms of the same element
Isotope
An arrangement of the elements showing the repeating pattern of their properties
Periodic Table
A one- or two-letter representation of an element
Chemical Symbol
Elements in the same vertical column of the periodic table; also called family
Group
A horizontal row of elements in the periodic table
Period
A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
Metals
An element that has some characteristics of both metals and nonmetals
Metalloid
An element that lacks most of the properties of a metal. It is dull, brittle, and poor conductor of heat and electricity
Nonmetal
The way a mineral reflects light from its surface
luster
A term used to describe material that can be hammered or rolled into flat sheets
malleable
A term used to describe a material that can be pulled out into a long wire
ductile
The ability of an object to transfer heat
Thermal conductivity
The ability of an object to carry electric current
electrical conductivity
The ease and speed wwith which an element combines, or reacts, with other elements and compounds
reactivity
A molecule consisting of two atoms
Diatomic molecule
A substance that can conduct electric current under some conditions
semiconductor
The family of elements found in Group 1 of the Periodic Table
Alkali metals
The family of elements found in Group2 of the Periodic Table
Alkaline Earth Metals
The family of elements found in Group 3 to 12 of the Periodic Table
Transition Metals
The family of elements found in Group 17 of the Periodic Table
Halogens
The family of elements found in Group 18 of the Periodic Table
Noble Gases
There are a total of how many periods in the Periodic Table?
7 Periods plus the Lanthanides and Actinides
There are how many groups in the Periodic Table?
18
The number 14 stands for what?
Atomic Number
The letters “Si” stand for what?
Chemical Symbol
The number 28.086 stands for what?
Atomic Mass