The Periodic Table

Question 1

Element

Answer 1

any substance which cannot be split into simpler substances by chemical means

Question 2

Anrione Lavoisier

Answer 2

-wrote the first list of 33 elemnts
-distinguished between metals and non metals

Question 3

Johann Dobereiner

Answer 3

-dobereiners triads
-grouped three elements with similar chemical properties in which the atomic wight of the middle element is approx. equal to the average of the other two
-earlierst attempt to trace a relationship between properties of elements and their atomic weight

Question 4

John Newland

Answer 4

-newland’s octaves
-group of elements arranged in order of increading atomic weight where the 1st and 8th elements of each group have similar chemical properties
-did not have all elemets as they hadn’t been discovered

Question 5

Dimitri Mendeleev

Answer 5

-arranged elements in order of increasing atoimc weight , each 8thelement had similar chemical properties
-left gaps for undiscovered elements
-had to reverse a few to have them fall inot groups of similar chemical properties

Question 6

Henery Mosley

Answer 6

-used xray to discover the no. of protons in an atom
-modern periodic table is an arrangement of elements of increasing atomic number

Question 7

Atomic Number

Answer 7

the number of protons in the nucleus of an atom
(atomic no is specific for each element as protons are the only part of the element that always stays constant

Question 8

Mass Number

Answer 8

the sum of the number of protons and neutrons in the the nucleus of an atom

Question 9

Isotopes

Answer 9

atoms of the same element but have different mass number due to different numbers of neutrons in the nucleus

Question 10

Mass Spectronometer Stages

Answer 10

1. sample is vaporised
   2.ionisation
   3.acceleration
2. deflection/ seperation
   5.detection

Question 11

Priciple of Mass Spectrometry

Answer 11

positively charged ions are separated by mass when travelling through a magnetic field

Question 11

Relative Atomic Mass

Answer 11

the average of the mass number of the isotopes of the element (AMU)

Question 12

Aufbau Principle

Answer 12

when building up the electron configuration of an atom in its groud state, the electrons occupy the lowest available energy levels

Question 13

Hand’s Rule of Maximum Multiplicity

Answer 13

when two or more orbitals of equal energy are available, the electrons occupy them singly before filling them in pairs

Question 14

Pauli Exclusion Principle

Answer 14

no more than two electrons may occupy an orbital and they must have opposite spin