Which of the following objects would float when placed in water? (note: 1 ml 1 cm+3)* apple: density-0.7 g/m gold: density 19.3 g/ml iron: density-7.8 g/ml rubber: density-1.2 g/ml

Only an apple will float when placed in water.

An object will float in water if its density is less than that of water (1.0 g/mL).

An object will sink in water if its density is greater than that of water.

Thus, solid objects made of gold, iron, or rubber will all sink in water.

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