Polar & Nonpolar

Polarity

It refers to the distribution of electric charge around atoms, chemical groups, or molecules. joined by atoms.

Transuranic elements

Synthetic elements or elements made in a laboratory are called

93

Starting of transuranic elements

Covalent compounds

Sharing of electron

Ionic compound

Transfer of electron

Valence electron

"outermost electrons" of the atom involved in chemical bonding.

Octet rule

states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas.

Lewis Dot Symbols

are diagrams that represent the valence electrons of an atom

Molecules

It is a group of two or more atoms held together by chemical bonds.

Electronegativity

It is the ability of an atom in a chemical bond to attract electrons toward it.

Ernest Rutherford

carried out a nuclear transmutation reaction

a process of transforming one element or isotope into another element

Particle accelerator

device that is used to speed up the orotons to overcome its repulsion betweer the protons and the target atomic nuclei by using magnetic and electric fields.

Dmitri Mendeleev

created a classification of elements based on their atomic weight

Henry Gwynn-Jeffreys Moseley

used Rutherford's work to solve the problems with Mendeleev's periodic table

1919

Rutherford successfully carried out a nuclear transmutation reaction in

James Chadwick

a neutral particle was discovered in 1932

Carlo Perrier & Emilio Segre

synthesized the first artificially prepared element, lechnetlun (Element 43), by bombardment of Molybdenum by deuterons in a particle accelerator