16. Magnesium has a density of 1.74g/cm3. A strip of magnesium metal measures 0.104m long and is 2.52mm wide. If the mass of the strip is 0.104 g, what is the thickness of the magnesium strip

228.1 m

Explanation:

Area of the magnesium strip = 0.104m  * 2.52 * 10^-3 = 2.62 * 10^-4 m^2

Density of Magnesium strip = 1.74g/cm3

Mass of magnesium strip = 0.104 g

But

density = mass/ area * thickness

density * area * thickness = mass

thickness  = mass/density * area

thickness  = 0.104 g/2.62 * 10^-4  * 1.74

thickness  = 0.104 g/ 4.56 * 10^-4

thickness  =  228.1 m

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.