The Periodic Table Flashcards
What does the Modern Periodic Law State?
The physical and chemical properties of all elements are the periodic function of their atomic number.
Who proposed the Modern Periodic Table
Henry Mosely in the year 1921
explain the structure of the table
It consists of:
1. Periods- 7 Horizontal rows
2. Groups- 18 Vertical Columns
mention the groups that are known as transition elements
3 4 5 6 7 8 9 10 11 12
mention the groups that are known as representative or normal elements
1 2 13 14 15 16 17
what are the noble gases?
Helium neon argon krypton xenon radon
why is zero group/inert/noble/rare gases name given?
because they have stable configuration following the octet rule.
What are group 1 elements known as
Alkali metals
what are group 2 elements known as
Alkaline earth metals
what are group 17 elements known as
Halogens (salt producers)
Give the simple classification of elements
- Representative elements
- Transition elements
- Inert gases
- Inner Transition elements which include lanthanoids and actinoids.
Define Periodicity
The properties that reoccur after a regular interval in the periodic table are periodic properties and the phenomenon is known as periodicity.
What are the factors on which Properties of an element depends upon ?
- Atomic radius/size
- Metallic Character
- Non-Metallic Character
- Ionisation Energy
- Electron Affinity
- Electronegativity
Define Ionisation Energy
It is the energy required to remove an electron from the outermost shell of an atom in its isolated gaseous state, thereby converting it into a positively charged ion.
Define Electron Affinity
Electron Affinity is the energy released on adding an electron to the outermost shell of an atom in its isolated gaseous state, thereby converting it into an anion.
inert gases have maximum _______ .
ionization potential
______ have low ionisation energy
Metals
_______ have zero electron Affinity
Inert gases
Non Metals have high _________ .
Electron affinty
________ have maximum electron affinty in their respective periods.
Halogens (grp 17)
Acidic character _________ as we move across a period
Increases
state the acidity of Cl2O7
Strongly Acidic
Basic Character ox oxides ________ as we move down the ________ .
- Increases 2. Group
Define Electronegativity
The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is called its electronegativity.
What is Diagonal Relationship? What is the collective name given to these elements?
The elements of the second group show resemblance to the the elements present in the group next group of the 3rd period present at a right diagonal, this is diagonal relationship. These elements are known as Bridge Elements
Give Examples of Bridge elements
Li & Mg
Be & Al
B & Si
