Ancient egyptians used a variety of lead compounds as white pigments in their cosmetics, including pbs, pbco3, pbcl(oh), and pb2cl2co3. which of these compounds contains the highest percentage of lead (by mass)

Answer : The compound contains the highest percentage of lead (by mass) is, PbS.

Explanation :

To calculate the percentage of lead in sample, we use the equation:

For :

Mass of = 239.3 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 86.58 %.

For :

Mass of = 267.2 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 77.55 %.

For :

Mass of = 259.7 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 79.78 %.

For :

Mass of = 545.3 g

Mass of Pb = 207.2 g

Putting values in above equation, we get:

The percentage of lead in the is 37.99 %.

Hence, from this we conclude that, the compound PbS contains the highest percentage of lead (by mass).

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.