An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?

A. 30 protons, 30 electrons

B. 15 protons, 15 electrons

C. 60 protons, 30 electrons

D. 30 protons, 0 electrons

Gold is alloyed with other metals to increase its hardness in making jewelery. a) Consider a piece of gold jewelry the weighs 9.85g and has a volume of 0.675cm^3. The jewelery contains only gold and silver which have densities of 19.3g/cm^3 and 10.

How many grams are in one mole of phosphide?

Which of the following statements is true about energy quantization at the atomic level? Electrons in the outermost orbits are the most stable. Electrons in all the orbits around the nucleus have the same amount of energy.

A 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evoled at 21degree celcius and 748mm of Hg?

How much water should be added to 0.07 moles of KCL to prepare a 0.5m solution

Why are 3 ammonium groups needed for every 1 nitride ion?

How do you explain the relativity high conductivity of tap water compared to a low or zero conductivity for distilled water

According to Newtons's first law, which characteristic of a moving object would remain constant if there were no other force of acting of it? A. Size B. Mass C. Shape D. Speed

Standard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).

Which compound is inorganic? a. glucose (c6hl2o6) b. carbon dioxide (co2) c. ethane (c2h6) d. stearic acid (cl8h36o2) ?