When lumps of calcium carbonate react with hydrochloric acid, carbon dioxide gas is released according to the equation shown below. CaCO3(s) + 2HCl(aq) > CaCl2(aq) + CO2(g + H2O(l)

What effect will the following have on the rate of the reaction?
i. Increasing the temperature.
ii. Using powder calcium carbonate instead of lumps.
iii. Use of catalyst.
iv. Adding water to the acid.

Will mark brainliest!!

i think it is d. e because the next one is igneous.

the answer is na (sodium)

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.