1. Use the data below to calculate the density of the metal. 20.2 ml
Mass of beaker
125.00 g
Volume of water
Volume of water with metal
25.8 ml
Mass of beaker and water
146.00 g
Mass of beaker, water, & metal
158.00 g
O 0.467 g/ml
O c. 5.89 g/mL
O d. 6.12 g/mL
O b. 2.14 g/mL

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.

i believe the answer is 5,000

5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3