The Periodic Table

Question 1

Element

Answer 1

is a substance that cannot be split into simpler substances by chemical means

Question 2

Triad

Answer 2

group of 3 elements with similar properties in which the atomic weight (relative atomic mass) of the middle element is equal to the average of the other 2

Question 3

Newlands Octaves

Answer 3

are arrangements of elements in which the 1st and 8th element counting from a particular element have similar properties

Question 3

Mendeleevs Periodic Law

Answer 3

when elements are arranged in order of increasing atomic weight the properties recur periodically

Question 4

Atomic Number

Answer 4

the number of protons in the nucleus of an atom

Question 5

Modern Periodic Table

Answer 5

arrangement of elements in order of increasing atomic number

Question 6

Mass Number

Answer 6

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

Question 7

Isotopes

Answer 7

are atoms of the same element (same atomic number) which have different mass numbers due to different numbers of neutrons

Question 8

Relative Atomic Mass

Answer 8

is the average of the mass numbers of the isotopes of the element as they occur naturally, taking their abundances into account and expressed on a scale in which the atoms of the carbon 12 isotope have mass of exactly 12 units

Question 9

Principle Of Mass Spectrometry

Answer 9

is that charged particles moving in a magnetic field are deflected to different extents according to their masses and are thus separated according to these masses

Question 10

Aufbau Principle

Answer 10

electrons occupy lowest available energy level

Question 11

Hunds Rule Of Maximum Multiplicity

Answer 11

when 2 or more orbitals of equal energy are available electrons occupy them singly before filling them in pairs

Question 12

Pauli Exclusion Principle

Answer 12

no more than 2 electrons may occupy an orbital and they must be of opposite spin