2.) How many grams are in 4.23 x 1024 atoms of He?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What are the first three quantum numbers for the electrons located in subshell 2s?