Science 8 Review

Who proposed the law of triads, grouping elements into sets of three based on similar properties?

• Dmitri Mendeleev

• John Newlands

• Johann Wolfgang Döbereiner

• Julius Lothar Meyer

which element is located in the Group 6, Period 5

• Molybdenum (Mo)

• Tungsten (W)

• Chromium (Cr)

• Niobium (Nb)

 Group 1 Period 1

• Sodium (Na)

• Hydrogen (H)

• Helium (He)

• Beryllium (Be)

 Which of the following elements is a metalloid?

• Sodium (Na)

• Hydrogen (H)

• Helium (He)

• Boron (B)

 Which principle states that electrons occupy the lowest energy orbitals available?

• Hund's rule

• Pauli exclusion principle

• Aufbau principle

• Octet rule

  Which of the following elements is expected to have similar chemical behavior to Carbon (C)?

• Boron (B)

• Silicon (Si)

• Beryllium (Be)

• Calcium (Ca)

  Which ancient Greek philosopher believed in the concept of the Trio Prima ?

• Aristotle

• Dmitri Mendeleev

• Paracelsus

• Marie Curie

   Considering its position in the periodic table, which element is expected to have the highest electronegativity?

• Sodium (Na)

• Oxygen (O)

• Aluminum (Al)

•  Argon (Ar)

   What is the electron configuration of nitrogen (N)?

• 1s² 2s² 2p¹

• 1s² 2s² 2p³

• 1s² 2s² 2p²

•  1s² 2s² 2p⁴

   The particles Gaseous substances have the highest kinetic energy.

• True

• False