Potassium, k, has an atomic number of 19 and an atomic mass of 39 how many electrons does a neutral atom of K have?

What's the most important factor in determining an elements place in the periodic table?

5 sentences about industries

What mass of ammonium sulfate ((NH4) 2SO4 132.15 g/mol) is required to produce 282 mL of a 2.50M solution of ammonium sulfate?

Circle the atom with the largest atomic radius in each group

In a classroom which comparison would a teacher most likely use when comparing a mole

Which of the following lines (of latitude or longitude) would represent by 180 longitude? South Pole Equator Prime meridian North Pole International date line

63Ni decays by a first-order process via the emission of a beta particle. The 63Ni isotope has a half-life of 100. years. How long will it take for 65% of the nickel to undergo decay?

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

How do I find the molar mass of Copper (II) Nitrate?

Describe several main ideas in chemistry