En cual de los siguientes grupos de elementos de la tabla periódica se encuentran los que tienen 8 electrones en su nivel de energía mas externo?

A-metales de transición

B-metales alcalinos

C-gases nobles

D-halógenos

Which of these are made up of matter? Check all that apply. A) parts of outer space where there is no air or atoms B) salt dissolved in water C) air in the lower levels of the Earth's atmosphere D) leather made from cowhides E) metal after if has

Anthony is interested in seeing the atoms in a piece of fish scale. he breaks the scale into the smallest piece he can, and look at it under a microscope. is he able to see the atoms of the fish scale? A. No, there are no atoms in a fish scale. B.

Some properties of liquid water are very different from those of solid water (ice). Explain why freezing is considered a physical change, even though the properties of water change when it freezes.

What are the two processes by which nuclear energy is released? Briefly describe the processes.

What do chemists think is the best measurement of concentration for describing the concentration of a solid solute dissolved in one liter of a liquid solution?

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

Give the full atomic symbol for an atom that has 30 neutrons and an atomic number of 25

Maxwell, a russian scientist, created an early peridoc table of the elements. true or false

Can the nature of a reactant be altered to speed up reaction

What describes the basis of the band theory of metallic bonding