Atomos
This is the smallest unit of an element that still keeps the properties of that element.
Atom
This is a pure substance made of only one type of atom.
element
This is the substance you start with in a chemical reaction.
Reactant
This type of bond forms when atoms share electrons.
Covalent bond
This substance produces hydrogen ions in water and usually has a pH less than 7.
acid
This positively charged particle is found inside the nucleus of an atom.
proton
This table organizes all known elements by increasing atomic number.
Periodic table
This is the substance that is formed after a chemical reaction happens.
product
This type of bond forms because positive and negative ions attract each other.
Ionic bond
This substance produces hydroxide ions in water and has a pH greater than 7.
base
This negatively charged particle moves around the nucleus of an atom.
electron
Elements in the same vertical column of the periodic table belong to this.
group
This type of reaction occurs when two or more substances combine to make one product.
Combination reaction
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This reaction happens when an acid reacts with a base to produce salt and water.
Neutralization
This central part of the atom contains protons and neutrons.
nucleus
This type of element has properties of both metals and non-metals.
metalloids
This type of reaction happens when one compound breaks apart into simpler substances.
Decomposition reaction
a compound composed of two different elements, usually two non-metals, that are joined together with covalent bonds
Binary molecular compound
This scale is used to measure how acidic or basic a solution is.
pH scale
This number tells how many protons an atom has.
Atomic number
These elements are usually shiny, good conductors of heat and electricity.
metal
This principle states that matter cannot be created or destroyed during a chemical reaction.
Conservation of mass
This particle is made of two or more atoms held together by covalent bonds and has no charge.
Molecule
This term describes how fast reactants turn into products during a chemical reaction.
Reaction rate