Which principal energy level of an atom contains an electron with the lowest energy?

A) n=1

B) n=2

C) n=3

D) n=4

ES How many milliliters of water should be added to 50.0 mL of a 1.0 M CaBr2 solution to create a 0.25 M solution?

Which form of carbon is the hardest

A mixture of methane and air is used in a lime kiln. Explain why?

1. The development of a life-saving drug for cancer patients using research from previous experiments is an example of? A. pure chemistry B. applied chemistry C. technical chemistry D. biochemistry

Avogadro's number is the number of particles in one mole of a pure substance true or false

A change of temperature equal to one kelvin is equal to a change of temperature of how many degrees celsius?

A solution has [h3o+] = 4.2*10-5 m. use the ion product constant of water kw=[h3o+][oh-] to find the [oh-] of the solution.

A. A rapid cooking method that uses high heat from a source located above the food.

What is the number of copper atoms in 1naira coin which weighs 7.39g assuming the material of which the coil is made is 86% copper Na=n/n number of moles/n

Which of the following statements are consistent with Rutherford's nuclear theory as it was originally stated? (A) The volume of an atom is mostly empty space. (B) The nucleus of an atom is small compared to the size of the atom.