Total number of valence electrons for B2O3

Water (H2O) is composed of the same elements as hydrogen peroxide (H2O2). how do their properties compare?

Why do the elements of the same group have similar properties?

Which of the following is true of group 6A? Includes Chlorine Includes Sulfur Gain 2 electrons Tend to form + 2 ions Have 5 valence electrons

Which of the following elements ia an alkali metal? A. potassium B. calcium C. chromium D. germanium

Choose the element that would be the most reactive of the three. A. K c. Na b. Fr

When you open a bottle of a soft drink and leave it open, the drink eventually goes flat. this happens because the equilibrium between carbonic acid and carbon dioxide shifts to produce?

When you go down a group, does the tendency for a metal to react (become duller) increase or decrease?

The force of gravity on Planet B is 3.4 m/sec2. A box weighs 34 N on Earth. What is the mass of the box? a) 3.47 kg b) 333.2 kg c) 115.6 kg d) 10 kg

Assume that 4 molecules of nitrogen and 9 molecules of hydrogen are present? after complete reaction, how many molecules of ammonia are proceded?

Which of the following are chemical changes? Check all that apply. A. sugar is dissolved in water B. A warm coke bottle fizzes when opened C. The Copper roof turns green over time D. Baking soda is dissolved in vinegar and bubbles appear E.