Chemistry Quiz: The Periodic Table

How did the chemist J. W. Dobereiner arrange the elements?

• J. W. Dobereiner arranged the elements in pairs based on their atomic numbers.
• J. W. Dobereiner grouped elements randomly without any specific criteria.
• J. W. Dobereiner arranged the elements with similar properties in groups of 3 (triad)

• J. W. Dobereiner classified elements according to their color and texture.

What did the scientist John Newlands do?

• John Newlands discovered the periodic table.
• John Newlands invented the microscope.
• John Newlands formulated the theory of relativity.
• John Newlands proposed the Law of Octaves and arranged the element according the atomic weight

How did the chemist Dmitri Mendeleev arrange the elements in his periodic table?

• By decreasing atomic number and sorting by color.
• By random selection without any specific criteria.
• By arranging elements based on their physical state at room temperature.
• By increasing atomic mass and grouping by chemical properties.

How are elements arranged in the modern periodic table?

• Elements are arranged by decreasing atomic mass in random order.
• Elements are arranged by increasing atomic number in rows (periods) and columns (groups) based on similar properties.
• Elements are grouped by color and size in the table.
• Elements are sorted based on their discovery date.

Compare between metals, non-metals & metalloids

What does Coulomb’s Law state?

• Coulomb's Law states that the force between two charges is inversely proportional to the product of their charges.
• Coulomb's Law states that the force between two point charges is proportional to the distance between them.
• Coulomb's Law states that the force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.
• Coulomb's Law states that the force between two charges is constant regardless of distance.

If particle charge increases, what happens to the pulling force?

• The pulling force remains the same.
• The pulling force decreases.
• The pulling force increases.
• The pulling force becomes zero.

If the distance between particles increases, what happens to the pulling force?

• The pulling force decreases.
• The pulling force fluctuates randomly.
• The pulling force remains the same.
• The pulling force increases.

What is the Shielding Effect?

• The shielding effect is the increase of effective nuclear charge on outer electrons.
• The shielding effect refers to the attraction between electrons in the same shell.
• The shielding effect is the reduction of effective nuclear charge on outer electrons due to the presence of inner shell electrons.
• The shielding effect is the phenomenon where outer electrons gain energy from inner shell electrons.

What is the Effective Nuclear Charge?

• Effective Nuclear Charge (Z_eff) is the net positive charge experienced by an electron in a multi-electron atom.
• The energy level of the outermost electron.
• The average distance of electrons from the nucleus.
• The total number of protons in an atom.