Name two elements in which the last electrons to be added are placed into s subshells

What was henri becquerel studying when he accidentally discovered radioactivity?

Calculate the empirical for the molecular formula mass and the molar mass of each of the following minerals: (a) Limestone, CaCO3 (b) halite, NaCl (c) beryl, Be3Al2Si6O18 (d) malachite, Cu2 (OH) 2CO3 (e) turquoise, CuAl6 (PO4) 4 (OH) 8 (H2O) 4

An Olympic-size pool is 50.0 m long and 25.0 m wide. a. How many gallons of water (density = 1.0 g/mL) are needed to fill the pool to an average depth of 4.8 ft? b. What is the mass, in kg, of water in the pool?

The quantum theory of energy levels within atoms was aided by:

You made a 100.0 mL of a lead (II) nitrate solution for lab but forgot to cap it. The next lab session you noticed that there was only 80.0 mL left (the rest had evaporated). In addition, you forgot the initial concentration of the solution.

The harder you strike a drum, the greater the sound's A) medium B) volume C) frequency D) pitch

The equation X + Y 2Z has the rate law equation shown below. Which of the following statements best describes the relationship of X on the rate of the reaction? rate = k[X]2[Y] Changing X has no effect on the reaction rate.

What moves in or out of a substance during a change of state?

2.5 moles of sodium chloride is dissolved to make 0.050 liters of solution

2. The minimized structure of phenacetin is planar, and the chemical shifts of the aromatic protons in the NMR spectrum can be rationalized by electron delocalization.