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Have two valence electrons and conduct heat and electricity; not as reactive as alkaline metals
What are alkaline earth metals?
Examples include color, shape, luster, hardness, density
What are physical properties?
Coined the term “atom”
Who was Democritus?
The number of electrons contained in one neutral atom of aluminum 28
What is thirteen?
The number of molecules in 8NaCl
What is eight?
Exist as single atoms; have full valence shells or contain eight valence electrons
What are noble gases?
Examples include rusting iron, burning paper, and digesting food
What are chemical changes?
First to discover that atoms contained electrons
Who was Thomson?
The number of neutrons in aluminum 28
What is fifteen?
The number of atoms in 6 molecules of water
What is eighteen?
The name of fluorine’s group
What are halogens?
The state of matter with the strongest molecular force
What is a solid?
Discovered electrons moved within energy levels and could absorb or release energy via photons
Who was Bohr?
The number of protons in mercury
What is eighty?
The molar mass of KCl
What is 74.55 g/mol?
Have high melting/boiling points, higher density than groups one or two, found in groups three through twelve
What are transition metals?
The change from a solid to a gas
What is sublimation?
Proposed elements were made of the same types of atoms
Who was Dalton?
Electrons contained in a neutral atom of cesium 135
What is fifty five?
Convert 7.5 g of C to mol
What is 0.62 mol of C?
Have one valence electron, soft, brittle, most reactive elements, bond with group seventeen elements to form salts
What are alkali metals?
A state of matter that has a specific volume but an indefinite shape
What is a liquid?
Discovered that the atom contained a positively charged nucleus
Who was Rutherford?
Number of neutrons in cesium 135
What is eighty?
The density of an object with a volume of 12.5 mL and a mass of 6.1g
What is .49 g/mL?