Please help I keep getting this wrong..~What volume of nitrogen dioxide (in L) is produced from the complete reaction of 16.87g of lead(II)nitrate at STP 2Pb(NO3)2 (g) -->2PbO(s) + 4NO2(g) + O2

Wagons/motorized vehicles

Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

Ans() ; the burning of them contributes to global warmingthey come from decayed organic material;

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.