The periodic table is the table of elements that is arranged to reflect the periodic trends of the elements. The periodic table also shows six different properties of the elements like atomic radius, atomic affinity, electronegativity, ionization energy and metallic or nonmetallic character.
Periodic Table Trends
Atomic radius: atomic radius is the half of the distance the atomic nucleus of two identical atoms which is touching to each other.
*the size of atomic radius always increases when you move from right to left
*the size of radius always increases as you move down in the periodic table.
The size increases while moving from right to left in the periodic table because each element has one more proton as well as on more electron and the shells of the electron always attracted by strong force to the nucleus who is positively charged. When we move down then we see that valence of an electron is same but elements have more proton and also they have gain electron energy shell because of that no atoms become larger.
Electron affinity: electron affinity is the ability of an atom to accept an electron which is measured by the change of energy as the electron is added to the element which is in gaseous form.
* The electron affinity always increases when we go across the row of the periodic table i.e from left to right.
* It always decreases when you move down in the periodic table.
Electronegativity: electronegativity is the measurement of the attraction between the nucleus and electron of the atom in the chemical bond. Generally, the element which has higher electronegativity there is the very stronger force of attraction between both bonded electron and the nucleus of the atom.
* electronegativity always increases when you go across the row of the periodic table i.e left to right.
* electronegativity always decreases when you move across the column of the periodic table i.e move down in the table.
Ionization energy: ionization energy is the type of energy that required to remove an electron from the gaseous form of atom. When nucleus tightly holds the electron required more energy to remove the electron.
* The ionization energy increases when you go from left to right in the table
* and it always decreases when you move towards down on the table.
Metal, metalloids, and nonmetals: the three different groups of elements in the periodic table are metal, nonmetal, and metalloids. Elements that are on the left side of the periodic table are metals and the elements which are on the right side are nonmetals.
Periodic Table Trends Worksheet
Properties of metals
- It is solid at room temperature.
- It has a high melting point.
- It is the good conductor of heat
- It losses electron in reaction.
- It is also a good conductor of electricity.
Properties of metalloids
- It is usually ductile
- It can gain as well as lose the electron.
- It is a good semiconductor.
- It conducts heat and electricity but not same as metals.
- It could be both shiny as well as dull.
Properties of non-metals
- It is no shiny
- It is also a poor conductor of heat.
- It gains electrons while reaction.
- It has the lower density.
- It is a poor conductor of electricity