The atomic and mass numbers for four different atoms are given below. which two are isotopes of the same element? (2 points)

atom

atomic number

mass number

a

100

257

b

101

259

c

101

260

d

102

259

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.