Elements in Group 18 are known as the noble gasses. What makes
these elements unlikely to react?
A the number and placement of the
protons
B the number of isotopes of the atom
C the number and placement of the
electrons
D the number of neutrons in the nucleus
of the atom

This drawing shows a human body system. what is the primary function of this body system?

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.

Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.