magnesium will react with acid to produce hydrogen, gas
What is chemical
100
all atoms of an element are ___________
What is identical
100
the number of protons
What is Atomic number
100
Element that is a liquid metal
What is MERCURY
100
who invented this : an invisible particle called the atom
What is DEMOCRITIS
200
The aluminum is very malleable
What is physical
200
Atoms of different elements are ______________
What is different
200
The number of protons and neutrons
What is MASS NUMBER
200
Any man made element.....
What is FLUORINE, PLUTONIUM, NOBELIUM, BOHRIUM
200
WHO DISCOVERED THIS : all matter is made up of tiny, invisible particles called the atoms
What is John dalton
300
lead has a very high density
What is physical
300
Atoms are rearranged to form new substances in chemical reactions but _____________
What is are never created or destroyed.
300
The mass of an atom ( weighted average of the masses of its isotopes)
What is ATOMIC MASS
300
The lightest weighted metalloid
What is Boron
300
who discovered the electron ?
What is J.J Thompson.
400
paper is a combustible material
What is chemical
400
all particles move faster when _________
What is HEATED
400
_____ of an atom occupies the same place in the periodic table, they have the same atomic number, and number of electrons. They have a different number of neutrons - as a result they have a mass number and a relative atomic mass.
What is ISOTOPES
400
number of gasses on the period table ?
What is 11
400
who discovered the nucleus ?
What is RUTHERFORD
500
digestion of proteins in your stomach
What is physical
500
particles are always in ____________
What is CONSTANT MOTION
500
These are found in layers of energy levels around the nucleus.