228 90th then decays by emitting alpha particles until 212 82pb is formed. how many alpha decays will occur during this chain process?

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

answer; natural resources;

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.