A calibrated flask was weighed to be 20.743 g. The flask was then filled to the 25.00mL mark with ethyl alcohol. The filled flask was weighed after adding the alcohol as 39.681 g. In a second experiment three small round objects of an unknown element (three beads weighing a total of 337.551 g) were dropped into a 100mL volumetric flask. The flask was then filled with ethyl alcohol to the mark. The content of the flask (beads and alcohol) was weighed and had a mass of 372.261 g. Calculate the density of one metal bead in g. Record your answer with 3 decimals.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

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

a corroding iron, if that's one of your choices

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.