Atomic Structure
Positively charged part of an atom
What is a proton?
Another name for the rows in the periodic table
What are periods?
An atom that is no longer neutral because it has lost or gained an electron.
What is an ion?
A change that alters the form of an object without changing what type of matter it is.
What is a physical change?
Type of change that occurs when atoms link together in new ways to create a substance different from the original substances.
What is a chemical change?
Negatively charged part of an atom
What is an electron?
The number of protons in an atom for any given element
What is the atomic number?
A bond in which electrons are shared unevenly.
What is a polar bond?
What happens when particles in an object start to move around faster and push on each other, expanding the object's volume?
What is thermal expansion?
Define compound.
What is a combination of 2+ elements with properties different from their elements?
Electrons in the level closest to the nucleus have the __ amount of energy
What is lowest?
Scientists who created the traditionally used version of the period table and recognized the similar properties of certain elements.
Who was Dmitri Mendeleev?
covalent bond
Chemical bond that forms between atoms when they share electrons
Why do objects shrink when they lose heat?
Thermal contraction
The difference between reactants and products:
An area of space around the nucleus that atoms' electrons can travel in
What is the electron cloud?
Noble gases don't combine easily with other elements because ___.
their outer energy levels are full, making them stable
Ionic Bond
What is an attraction between a positively and negatively charged ion?
The type of change that occurs when a mixture is created
What is a physical change?
Why does the total mass of reactants in a reaction equal the total mass of products?
Law of Conservation of Mass
In an atom, the 1st energy level can hold __ electrons, the second can hold __ , and the third can hold __.
What are 2, 8, and 18?
The most reactive element in the halogen group
What is flourine?
Ionic bonding occurs between __ and __, but covalent bonding occurs between __ and __.
What are metals & nonmetals, nonmetals & nonmetals?
Define colloid.
What is a mixture that doesn't settle?
What is a solid formed from the chemical reaction of two solutions?