Which subatomic particle has the lowest mass?

Within an energy level, the _______ orbital is the highest in energy.

285.2 K is also _______ °F. (Hint: oF = (9/5)oC+32 and oC = K-273)

What is the frequency (in Hz) of a photon of light with a wavelength of 615 nm? (Hint: c = νλ, speed of light = 3.00×108 m/s, and 10-9 m = 1 nm)

Periodic Table of Elements

A student measures the volume of a solution to be 0.03010 L. How many significant digits are in this measurement?

Which of the following is equal to 623? 

Which portion of the electromagnetic spectrum has the highest frequency of the given choices?

A certain element is composed of two isotopes, having the mass and abundance shown below.  What is the average atomic mass unit (amu) for this element?   Mass Abundance Isotope 1: 35.0 amu 75.8% Isotope 2: 37.0 amu 24.2% (Hint: Atomic mass = Σ(mass of isotope)(abundance of isotope))

An atom has atomic number 92 and mass number 238. Which of these is an isotope of this atom?