Scientists
Mendeleev created the first period table by arranging elements in order of this.
What is increasing atomic mass.
There are 18 of these in the periodic table
What is a periodic group?
Ability to be hammered or rolled into flat sheets and other shapes
what is malleability?
The following properties describe this
Most are poor conductors of electricity and heat.
Most are reactive with other elements.
Solid nonmetals are dull and brittle.
They have lower densities than metals.
Atoms with the same number of protons and different number of neutrons are called this
What is isotopes?
This scientist inferred than an atom's positive charge must be clustered in the Nucleus.
This determines the number of protons in the nucleus of the atom.
What is the atomic number?
ability to be pulled out, or drawn, into a long wire
what is ductility?
These three elements are solids at room temperature
What are Carbon, iodine, and sulfur
This scientist, in 1896, discovered the effects of radioactive decay by accident while studying a mineral that contained uranium.
Who is Henri Becquerel?
In 1897, another British scientist, discovered that atoms are made from even smaller parts.
J.J. Thomson
These are part of Periods 6 and 7, but are printed below the others. They are not part of the 18 groups. If they were inserted into the table according to their atomic numbers, it would be difficult to fit that version into the book.
What are the Lanthanides and actinides?
ability of an object to transfer heat or electricity to another object
what is conductivity?
This element is the most reactive element known
What is Flourine?
Becquerel presented his findings to this young researcher and her husband, Pierre.
Who is Marie Curie?
In 1932, British scientist discovered another particle in the nucleus of an atom – the neutron.
James Chadwick
1-2 letters that represent the element
ability to reflect light
what is shininess?
This element is the only non metal in group 14
What is carbon?
This particle consists of 2 protons and 2 neutrons. It is positively charged.
What is an alpha particle?
In 1913, a Danish scientist and student of both Thomson and Rutherford, showed that electrons could have only specific amounts of energy, leading them to move in certain orbits.
Who is Niels Bohr?
The number of elements currently included in the periodic table
include the familiar metals of iron, copper, nickel, silver, and gold.
what is the transition metals?
Fluorine, chlorine, bromine, iodine, and astatine are all known as this
What is the halogens?
It would take several centimeters of lead or a concrete wall to stop this kind of rays.
what is gamma rays?