What is the correct formula for the
compound made form lead and chloride?
PbCl2
Pb2C1
PbCI
PbC14

PbCl2

Explanation:

Pb has a valency of 2

Cl has a valency of 1

During bonding, there will be an exchange of ions as shown below:

Pb^2+ + Cl^- —> PbCl2

Balance the equation by putting 2 in front of Cl-

Pb^2+ + 2Cl^- —> PbCl2

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.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer