Elements and Atoms
Anything that has mass and occupies space
What is matter
Elements in group 18 who do not easily react with other elements
What are the noble gases
A combination of symbols that shows the ratio of elements in a compound
What is a chemical formula
A covalent bond in which electrons are shared equally
What is a nonpolar bond
Material made of two or more elements with the properties of a metal.
What is an alloy
An electrically neutral subatomic particle
What is a Neutron
The number of protons in the nucleus of an atom as shown in the periodic table
What is the atomic number
a number which tells you the ratio of elements in a compound
What is a subscript
A chemical bond formed when two atoms share electrons
what are covalent bonds
The ability to be rolled into thin sheets or beaten into complex shape
What is malleability or being malleable
The simplest form of a pure substance which cannot be broken down into any other substance
What is an element
One or two letters showing the identity of an element in the periodic table
What is the symbol
Ions that are made of more than one atom
What are polyatomic ions
A covalent bond in which electrons are shared unequally
An attraction between a positively charged metal ion and the electrons surrounding it which will hold metal ions in a crystalline configuration.
What is a metallic bond
Scientist who proposed that atoms might be similar to muffins with scattered charged particles randomly throughout like raisins in a muffin.
Who was Thomson
An elements symbol surrounded by dots that each represent one valence electron
What is an electron dot diagram
how ionic bonds are formed?
atoms lose or gain electrons which makes them electrically charged ions. These ions combine with ions with opposite electrical charges since opposite electrical charges attract and we call that an ionic bond.
The force that holds covalent bonds together
What is the attraction of each atoms nucleus to the shared pair of electrons
This is formed by positively charged metal ions embedded in a "sea" of valence electrons
A metal crystal
A model describing an atom as mostly empty space with electrons moving around a small positively charged nucleus in the center.
This property of an atom determines how the element will react with others including how the element forms bonds with other elements.
What is the number of valence electrons
List at least three of the properties of ionic compounds
Hard, Brittle crystals, high melting points, conduct electricity well if melted or dissolved in water. (need three to gain points, if at least two are correct you don't lose points)
The reason polar bonds exist within some molecules such as water for example
What is because the oxygen in water attracts electrons more strongly than the hydrogen so the electrons spend more time near the oxygen making it more negative than the hydrogen.
list at least three of the properties of metals
what are: luster, malleability, ductility, electric conductivity, and thermal conductivity. (need three for points at least two correct and you don't lose points)