Im confused there is an example in image 1 i dont know how im too lazy to do it

Atomic weight =

(AMU*Abundance%)+(AMU*Abundance%)

so thats

(62.9296*69.15/100)+(64.9278*30.85/100)

43.5158184+20.0302263

≈63.55 amu

hope i helped

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.

b.

the accuracy of the data.