3. What do we call atoms of the same elements with different mass numbers?

10. You can protect yourself from radiation by going up to a higher elevation increasing the time you are exposed increasing your water intake getting further away from the radiation source

What mass of KBr (in grams) do you need to make 250.0 mL of a 1.50 M KBr solution?

Which of the following would you expect to form an ionic bond when combined? a) Li and Na b) Mg and Cl c) P and O d) H and Cl

A student reacted NiS2 (MM = 122.83 g/mol) with O2 (MM=32.00 g/mol) to make SO2 (MM=64.07 g/mol) according to this balanced equation 2NiS2+5O2=2NiO+4SO2 If the actual amount of SO2 made were (4.3090x10^2) g ehen the theoretical yield was (8.

What is "the international system of units"?

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window

How are you enjoying this weather? (i need good reasons}

In today's experiment, some lab students let their chromatograms elute slightly longer than others. If one student's solvent front traveled to 9.80 cm, and another student's solvent front traveled 8.