Atomic History

Front

What is the Plum Pudding Model?

Back

A model proposed by J.J. Thomson that describes the atom as a sphere of positive charge with negatively charged electrons embedded within it.

Front

Who proposed the Planetary Model of the atom?

Back

Niels Bohr proposed the Planetary Model, which depicts electrons orbiting the nucleus in defined paths, similar to planets orbiting the sun.

Front

What is an orbital in atomic theory?

Back

An orbital is a region in an atom where there is a high probability of finding an electron.

Front

What did John Dalton claim about compounds?

Back

John Dalton claimed that compounds consist of atoms in a fixed ratio, forming the basis of his atomic theory.

Front

Who discovered the nucleus of the atom?

Back

Ernest Rutherford discovered that the atom has a small, dense, positively charged center called the nucleus.

Front

What is the significance of the electron cloud model?

Back

The electron cloud model describes the probable locations of electrons around the nucleus, emphasizing their wave-like behavior.

Front

What is the main idea of Democritus's atomic theory?

Back

Democritus proposed that matter is made up of small, indivisible particles called atoms.

Front

What did Robert Millikan contribute to atomic theory?

Back

Robert Millikan conducted the oil drop experiment, which measured the charge of the electron and confirmed its existence.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the role of protons in an atom?

Back

Protons are positively charged particles found in the nucleus of an atom and determine the element's identity.