Chem scientists

Question 1

who published the classification system in which elements were grouped in triads

Answer 1

J.W dobereiner

Question 2

In 1969 who published a table of elements arranged in order of increasing atomic mass

Answer 2

Dmitri Mendeleev

Question 3

first to suggest existance of atoms, and that they were indivisable and indestructable

Answer 3

Democritus

Question 4

Discovered electron

Answer 4

JJ. Thompson

Question 5

concluded electrons have -1 charge

Answer 5

Robert Milikan

Question 6

what is a quantum

Answer 6

the amount of energy an electron needs to move levels

Question 7

what is the quantum mechanical model

Answer 7

it determines the allowed energies an electron can have and how likly it is to find the electrons in various locations around the nuclues

Question 8

aufbaus principle

Answer 8

electrons occupy the lowest orbitals first

Question 9

paulis exclusion principle

Answer 9

an atomic orbital can have at most 2 electrons

Question 10

hunds rule

Answer 10

states that one electron will enter each orbital until all the orbitals contain one electron with the same spin direction