In the quantum-mechanical model of the atom, which of the following is NOT one of the four quantum numbers needed to specify the probable location of an electron?
A. Principal quantum number (n) which describes the energy level/distance from the nucleus
B. Heisenberg number (H) which describes the electron's position and momentum.
C. Angular quantum number (1) which describes the shape of an electron's orbital
D. Magnetic quantum number (ml) which describes the orbitals orientation in space

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.