Vwould radiation with a wavelength 0.91 nm or a frequency of 5.9×1011 s−1 be detected by an x-ray detector? would radiation with a wavelength 0.91 or a frequency of 5.9×1011 be detected by an x-ray detector? only the radiation with a wavelength 0.91 nm can be observed by an x-ray detector. only the radiation with a frequency of 5.9×1011 s−1 can be observed by an x-ray detector. both types of radiation can be observed by an x-ray detector. neither type of radiation can be observed by an x-ray detector.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year