Atomic Structure

What is the smallest particle of an element that still has the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

Who was the first to name the atom?

• John Dalton

• Dmitri Mendeleev

• Democritus

• Albert Einstein

Which scientist developed the first periodic table of elements?

• John Dalton

• Dmitri Mendeleev

• Democritus

• Isaac Newton

What is John Dalton's model of the atom known as?

• Solid Sphere model

• Plum Pudding model

• Nuclear model

• Quantum model

What is the main idea of JJ Thomson's Plum Pudding Model proposed in 1904?

• The atom is indivisible and solid.

• The atom is a positively charged sphere with negative particles embedded throughout.

• The atom has a dense nucleus with electrons orbiting around it.

• The atom is mostly empty space with a small dense center.

What experiment led to the development of Ernest Rutherford's Nuclear Model in 1911?

• Oil drop experiment

• Cathode ray tube experiment

• Gold foil experiment

• Double-slit experiment

What did Henry Moseley discover in 1913 that was crucial for the arrangement of the Periodic Table?

• Electrons travel in fixed orbits.

• The number of protons is unique to each element.

• Atoms are indivisible.

• Neutrons are present in the nucleus.

According to the Niels Bohr Model proposed in 1913, how do electrons behave?

• Electrons are stationary within the nucleus.

• Electrons travel in fixed orbits around the nucleus.

• Electrons are randomly scattered within the atom.

• Electrons do not exist in the atom.

What is a key feature of the Schrodinger and Heisenberg Electron Cloud Model introduced in 1926?

• Electrons travel in fixed orbits.

• Electrons are embedded in a positively charged sphere.

• The nucleus is surrounded by an electron cloud divided into shells.

• The atom is a solid indivisible mass.

What is the charge of the nucleus?

• Negative

• Neutral

• Positive

• No charge