Question

which of the following is characteristic of non - metals?
a) they tend to be denser than metals.
b) theyre strong conductors of electricity.
c) theyre always solids at room temperature.
d) they tend to gain electrons in chemical reactions.
question 11 (5 points)
listen
electrons in atoms exist in particular energy levels. a _______ must be emitted or absorbed to move between energy levels.
a) quantum
b) photon
c) electron

Explanation:

• Non - metals: In chemical reactions, non - metals have a tendency to gain electrons to achieve a stable electron configuration (like a noble gas configuration). Metals are generally denser than non - metals. Non - metals are poor conductors of electricity (except for some like graphite which is a form of carbon). Non - metals can be in different states at room temperature (e.g., oxygen is a gas, bromine is a liquid).
• Electron energy levels: When an electron moves between energy levels in an atom, a photon (a particle of light/electromagnetic radiation) is emitted (when moving to a lower energy level) or absorbed (when moving to a higher energy level). A quantum is a discrete amount of energy, but the specific entity emitted/absorbed when an electron moves between energy levels is a photon. An electron is the particle that is moving between energy levels, not what is emitted/absorbed.

Answer:

D. They tend to gain electrons in chemical reactions; B. photon