Chem Vocab Unit 2

Question 1

Dalton’s Atomic Theory

Answer 1

Atoms cannot be created or destroyed

Question 2

Electron

Answer 2

Negatively charged subatomic particle present in all atoms

Question 3

Neutron

Answer 3

Subatomic particle found in the nucleus of every atom

Question 4

Nucleus

Answer 4

tiny, dense, central core of an atom composed of neutrons and protons

Question 5

Proton

Answer 5

positively charged subatomic particle present in all atoms

Question 6

mass number

Answer 6

total number of protons and neutrons in an atom

Question 7

atom

Answer 7

smallest particle of an element that keeps the properties of that element

Question 8

atomic number

Answer 8

number of protons in the nucleus of each atom

Question 9

atomic mass unit

Answer 9

mass= to 1/12 the mass of an atom of carbon-12

Question 10

atomic mass

Answer 10

weighted average of the atomic masses of the naturally occurring isotopes of that element

Question 11

avagrado’s number

Answer 11

number of representative particles in a mole of any substance

Question 12

mole

Answer 12

amount of substance that contains 6.02 x 10^23 representative particles of that substance

Question 13

representative particle

Answer 13

smallest unit in which a substance naturally exists, usually an atom, ion, molecule or formula unit