In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?

F, 19 protons, 19 electrons

Cs, 55 protons, 132.9 electrons

Zn, 30 protons, 60 electrons

In, 49 protons, 49 electrons

If you knew the valence electrons in a nonmetal atom, how who you determine the valence of the element?

What is the % nitrogen by weight in 4.039 mol of ammonium sulfide? answer in units of %?

An element is a substance that cannot be broken down chemically into A. electrons. B. another substance. C. atoms. D. protons

7. What is the difference between a measured value and an accepted value? How are these values used to determine the precision of your answer?

1. Write the molecular equation, ionic equation, and net ionic equation for the reaction between calcium chloride and ammonium phosphate.

How many different values of l are possible in the third principal level?

15 mL of a 0.16 M solution of glucose was diluted until the total volume reached 95 mL. What is the concentration of new solution?

Mendeleev used his arrangement of elements in order of increasing mass and repeated properties to predict the mass and properties of undiscovered elements. true or false

Describe the basic characteristics of each group of elements on the periodic table

When a 0.1 M H2SO4 solution is added to pulverized blackboard chalk, the following reaction takes place. CaCO3 (s) + H2SO4 (aq) - -> CaSO4 (s) + CO2 (g) + H2O (l) At 25°C, the reaction is spontaneous and has: A. negative ΔG' and positive ΔS' B.