Intro to Atoms
The positively charged particles in the nucleus.
Protons
Describe the Modern Model of the Atom.
At the center of the atom is a tiny, dense nucleus containing protons and neutrons. Surrounding the nucleus is a cloudlike region of moving electrons.
An atom or group of atoms that has an electric charge.
Ion
A chemical bond formed when two atoms share electrons is called..
An attraction between the positive metal ion and the electrons surrounding it is called?
a Metallic bond.
Negatively charged particles located in the cloud around the nucleus of an atom.
Electrons
It takes almost 1,840 of these to equal the mass of one proton.
Electrons
Ions that are made of more than one atom.
Polyatomic Ions
A neutral group of atoms joined together by covalent bonds is a..
Molecule.
The term meaning the ability of metals to be rolled into thin sheets, as aluminum foil, or beaten into complex shapes is called?
Malleability
The subatomic particle located in the nucleus with no electric charge.
Neutron
The atomic number of an element is equal to the number of these in an atom's nucleus.
Protons
When ionic crystals dissolve in water, the ions are free to move around so the solution can..
Conduct electricity.
What are the two properties of molecular compounds?
Poor conductivity and low melting/boiling points.
A metal crystal consists of positively charged metal ions embedded in a "sea" of freely moving..
Valence electrons.
Atoms with the same number of protons and different number of neutrons.
Isotopes
The chemical symbol for an element surrounded by dots that represent the number of valence electrons in an atom.
Electron dot diagram
In a chemical formula for an ionic compound, the item written first is..
The name of the positive ion
How many pairs of electrons are shared in a triple bond?
3
The mixture made of two or more elements, at least one of which is a metal is called a(n)..
Alloy.
The sum of the protons and neutrons in an atom.
Mass number
These lie along the zigzag line in the periodic table and have traits of both metals and nonmetals.
Metalloids
Name this ionic compound: Li2O
Lithium oxide
Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is..
Polar
Electrical and thermal conductivity of metals are due to the valence electrons within the metal to move..
Freely