Layering in sedimentary rocks can have many causes. These layers are known as beds or bedding. Choose from the following list all the possible causes of bedding. i. Change in oxygen isotope ratios in the water
ii. Change in climate
iii. Change in oxygen isotope ratios in the atmosphere
iv. Discrete events
v. Change in sea level
vi. Change in sediment supply
vii. Change in currents

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.