Sodium (Na) has 11 protons and 12 neutrons. What is its isotope notation? A. Na-11
O B. Na-12
C. Na-23
D. Na-34

Which statement about the stamps is correct?

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.