5. If an element has 12 protons and 17 neutrons, how many electrons must it have?

The element chlorine (Cl) has 17 protons and 17 electrons. What happens to an atom of chlorine (Cl) if it gains an electron?

Natation TT mean to genetics

Calculate the decrease in temperature (in Celsius) when 2.00L at 21.0*C is compressed to 1.00.

In an experiment using a calorimeter, the following data were obtained: what is the total number of joules absorbed by the water? A.) 1,000 B.) 1,500 C.) 6,300 D.) 4,500

Select the correct answer. Which types of orbitals are found in the principal energy level n = 3? A. s, d B. s, p, d C. s, p D. s, p, f E. s, d, f

In the chemical formula 3NO2 the number 3 is a

W (g) + X (g) - -> Y (g) + Z (g) Gases W and X react in a closed, rigid vessel to form gases Yand Z according to the equation above. The initial pressure of W (g) is 1.20 atm and that of X (g) is 1.60 atm. No Y (g) or Z (g) isinitially present.

In this process, a piece of paper with small holes in it separates a heterogeneous mixture by letting through the small particles and keeping out the big ones. That is called as

The double bond between carbon and oxygen is similar to an alkene C-C, except that C o is: a) shorter and weaker. b) shorter and stronger c) longer and weaker. d) longer and stronger.

Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0576 M 17.1 s after the reaction starts and is 0.0249 M 97.8 s after the reaction starts.