Science 8 Quiz #4 3rd Quarter

Who first introduced the concept of triads in classifying elements?

• John Newlands
• Dmitri Mendeleev
• Johann Dobereiner
• Henry Moseley

What classification system did John Newlands propose in 1863?

• Periodic Law
• Law of Octaves
• Atomic Mass Order
• Noble Gas Theory

Which two scientists independently created similar periodic tables?

• Meyer and Mendeleev
• Newlands and Moseley
• Boyle and Lavoisier
• Einstein and Bohr

What was the primary basis of Mendeleev’s periodic table?

• Atomic number
• Atomic mass
• Electron configuration
• Density of elements

Henry Moseley improved the periodic table by arranging elements based on:

• Atomic weight
• Chemical properties
• Atomic number
• Electron affinity

What does the atomic number represent?

• Number of neutrons
• Number of protons
• Mass of an atom
• Number of isotopes

The periodic table is organized into vertical columns called:

• Periods
• Groups
• Series
• Blocks

The horizontal rows in the periodic table are called:

• Groups
• Series
• Periods
• Clusters

Which group contains the alkali metals?

• Group 1
• Group 2
• Group 17
• Group 18

Which element is NOT an alkali metal?

• Sodium
• Potassium
• Hydrogen
• Lithium