Answer:
Halogens have 7 valence electrons.
Explanation:
They are the most active non-metals including fluorine, chlorine, bromine, iodine, and astatine
Answer:
They take the form of heat.
Explanation:
Electromagnetic waves with wavelengths greater than 750 nm are infrared light.
They are not visible to human eyes, but we can feel them as heat on our skin.
B is wrong. It is UV light that causes skin cancer and sunburn.
C is wrong .Visible and UV light have shorter wavelengths.
D is wrong. Human eyes cannot see IR radiation
Answer:
Al, Zn, Fe, Sn, Pb.
Explanation:
The arrangement can be done using the infomation on electrochemical series of metals.
The electrochemical series is built up by arranging various metals in order of their standard electrode potentials (or reactivity). The most negative E° values are placed at the top of the electrochemical series, and the most positive at the bottom. some of the metals are arranged as follws; K, Na, Ca, Mg, Al, Zn, Fe, Sn, Pb, H, Cu, Hg, Ag, Au (decreasing reactivity)
One can use the following to remember the arrangement: king Nathan Can Manage All Zone Freely Since Probably He Can Handle All Ages.
