Scientists
Dalton
What is the atomic theory?
Number of protons
What is atomic number
Number of electrons in a full outer shell
What is eight
Noble gases
What is the name for the last column
H
What is hydrogen
Watson and Crick
Who built the model of DNA?
mass of an electron
What is zero
Type of bond when the electronegativity difference is zero
Whatt is a non-polar covalent bond
Vertical rows
What are groups or families?
Cl
What is chlorine
Model of atom with electrons in concentric circles
Who is Bohr?
number of protons plus number of neutrons
What is mass number
Covalent bond
Bond in which atoms share one or more pairs of electrons
Horizontal rows
What are periods?
Calcium
What is Ca
Democratis
Who named the atom?
charge on a neutron
What is zero
type of bond where atoms exchange electrons
What is an ionic bond
Basis on which elements are arranged
What is increasing atomic number
Iron
What is Fe
Mendeleev
Who created the periodic table?
Two atomic particles with opposite charges
What are the proton and electron
type of bond that holds the nitrogen pairs together in DNA
What is a hydrogen bond?
Old name for Noble gases
What are inert gases
Au
What is gold