Atomic Theory
The smallest particle that can still be considered an element.
What is an atom?
The scientist who organized elements by their repeating patterns of properties and called it The Periodic Table
Who is Dmitri Mendeleev?
An element in period 3 of the periodic table has this many energy levels (or electron shells)
What is three?
Substances that are formed with two or more elements bond together
What are compounds?
An atom that has either a positive or negative charge as a result of losing or gaining an electron
What is an ion?
The three subatomic particles of an atom
What are protons, neutrons, and electrons?
What is the atomic number?
An element in group 17 of the periodic table has this many valence electrons
What is seven?
These are stored in an atoms outermost energy level, most metals have 1 to 3 of these
What are valence electrons?
The charge that Sodium (Na) has if it loses one electron
What is +1?
Rutherford was the first to discover that an atom has a dense, positively charged center called this
What is a nucleus?
The Periodic Tables' vertical (top to bottom) columns represent this
What are groups?
Elements in groups three through 12 of the Periodic Table are called this
What are Transition Metals?
What is: conductivity or ductility or maleability?
What is an ionic bond?
These two subatomic particles represent the atomic mass of the atom.
What are protons and neutrons (nucleus)?
The Periodic Table horizontal rows (left to right) represent this
What are periods?
The number of electrons it takes to fill the outer energy level of an element in period 4
What is 18?
Solid non-metals tend to have these two physical properties
What are dull and brittle?
When two non-metals share electrons, this is called
What is the atomic number?
As you move from left to right on The Periodic Table, this happens to the elements
What is: the atomic number increases, they change from metals to non-metals, valence increases, they become more stable, they become less reactive
The simplest and lightest element on the periodic table containing only 1 proton and 1 electron
What is Hydrogen?
This group of elements have some properties of metals and some properties of non-metals
What are metalloids?
When the two elements sharing electrons are the same element, they pull equally on the electrons and form this type of covalent bond
What is a nonpolar bond?